diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..4e3bb4c
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main, master]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js 22
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Install Grunt CLI
+        run: npm install -g grunt-cli
+
+      - name: JSHint
+        run: grunt jshint
+
+      - name: Tests
+        run: npm test
diff --git a/.mise.toml b/.mise.toml
new file mode 100644
index 0000000..e3cc1a4
--- /dev/null
+++ b/.mise.toml
@@ -0,0 +1,2 @@
+[tools]
+node = "22.22.1"
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 22a212b..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-language: node_js
-node_js:
-  - 0.10
-before_install:
-  - npm install -g grunt-cli
-script:
-  - grunt jshint
-  - npm test
diff --git a/lib/nodes/betaNode.js b/lib/nodes/betaNode.js
index 81a1c8c..90a332b 100644
--- a/lib/nodes/betaNode.js
+++ b/lib/nodes/betaNode.js
@@ -26,20 +26,29 @@ Node.extend({
             }
         },
 
-        dispose: function () {
+        // visited: skip shared betas; propagateDispose: downstream joins get dispose + Memory#clear.
+        dispose: function (assertable, visited) {
+            visited = visited || {};
+            if (visited[this.__count]) {
+                return;
+            }
+            visited[this.__count] = true;
             this.leftMemory = {};
             this.rightMemory = {};
             this.leftTuples.clear();
             this.rightTuples.clear();
+            this.propagateDispose(assertable, undefined, visited);
         },
 
         disposeLeft: function (fact) {
+            // Fact-scoped retract path: clear left side only, then notify downstream.
             this.leftMemory = {};
             this.leftTuples.clear();
             this.propagateDispose(fact);
         },
 
         disposeRight: function (fact) {
+            // Mirror of disposeLeft for right-input retractions.
             this.rightMemory = {};
             this.rightTuples.clear();
             this.propagateDispose(fact);
diff --git a/lib/nodes/fromNode.js b/lib/nodes/fromNode.js
index 3b2135c..11f1fb9 100644
--- a/lib/nodes/fromNode.js
+++ b/lib/nodes/fromNode.js
@@ -41,6 +41,12 @@ JoinNode.extend({
             this.__variables = vars;
         },
 
+        // Drop from-derived fact index; super clears join tuples and walks out-edges.
+        dispose: function () {
+            this.fromMemory = {};
+            this._super(arguments);
+        },
+
         __createMatches: function (context) {
             var fh = context.factHash, o = this.from(fh);
             if (isArray(o)) {
diff --git a/lib/nodes/fromNotNode.js b/lib/nodes/fromNotNode.js
index 66900dc..b0696a2 100644
--- a/lib/nodes/fromNotNode.js
+++ b/lib/nodes/fromNotNode.js
@@ -35,6 +35,12 @@ JoinNode.extend({
 
         },
 
+        // Same as FromNode: fromMemory is outside BetaNode hash/tuples.
+        dispose: function () {
+            this.fromMemory = {};
+            this._super(arguments);
+        },
+
         retractLeft: function (context) {
             var ctx = this.removeFromLeftMemory(context);
             if (ctx) {
diff --git a/lib/nodes/index.js b/lib/nodes/index.js
index 2f4e6ed..0e89f26 100644
--- a/lib/nodes/index.js
+++ b/lib/nodes/index.js
@@ -96,10 +96,12 @@ declare({
             });
         },
 
+        // One visited map for the whole dispose walk (cycles / sharing).
         dispose: function () {
+            var visited = {};
             var typeNodes = this.typeNodes, i = typeNodes.length - 1;
             for (; i >= 0; i--) {
-                typeNodes[i].dispose();
+                typeNodes[i].dispose(visited);
             }
         },
 
diff --git a/lib/nodes/leftAdapterNode.js b/lib/nodes/leftAdapterNode.js
index 1b542c7..0a7aab9 100644
--- a/lib/nodes/leftAdapterNode.js
+++ b/lib/nodes/leftAdapterNode.js
@@ -22,10 +22,6 @@ Node.extend({
             this.__propagate("retractResolve", match);
         },
 
-        dispose: function (context) {
-            this.propagateDispose(context);
-        },
-
         toString: function () {
             return "LeftAdapterNode " + this.__count;
         }
diff --git a/lib/nodes/node.js b/lib/nodes/node.js
index b486aa2..3f9722b 100644
--- a/lib/nodes/node.js
+++ b/lib/nodes/node.js
@@ -84,20 +84,27 @@ declare({
             }
         },
 
-        dispose: function (assertable) {
-            this.propagateDispose(assertable);
+        // Pass `visited` through from RootNode.dispose.
+        dispose: function (assertable, visited) {
+            visited = visited || {};
+            if (visited[this.__count]) {
+                return;
+            }
+            visited[this.__count] = true;
+            this.propagateDispose(assertable, undefined, visited);
         },
 
         retract: function (assertable) {
             this.propagateRetract(assertable);
         },
 
-        propagateDispose: function (assertable, outNodes) {
+        propagateDispose: function (assertable, outNodes, visited) {
+            visited = visited || {};
             outNodes = outNodes || this.nodes;
             var entrySet = this.__entrySet, i = entrySet.length - 1;
             for (; i >= 0; i--) {
                 var entry = entrySet[i], outNode = entry.key;
-                outNode.dispose(assertable);
+                outNode.dispose(assertable, visited);
             }
         },
 
diff --git a/lib/nodes/notNode.js b/lib/nodes/notNode.js
index e788862..28d3141 100644
--- a/lib/nodes/notNode.js
+++ b/lib/nodes/notNode.js
@@ -16,6 +16,12 @@ JoinNode.extend({
             this.notMatch = new Context(new InitialFact()).match;
         },
 
+        // BetaNode.dispose does not reset blocked-tuple map; clear before super chain.
+        dispose: function () {
+            this.leftTupleMemory = {};
+            this._super(arguments);
+        },
+
         __cloneContext: function (context) {
             return context.clone(null, null, context.match.merge(this.notMatch));
         },
diff --git a/lib/nodes/rightAdapterNode.js b/lib/nodes/rightAdapterNode.js
index 100570a..40911ad 100644
--- a/lib/nodes/rightAdapterNode.js
+++ b/lib/nodes/rightAdapterNode.js
@@ -7,10 +7,6 @@ Node.extend({
             this.__propagate("retractResolve", match);
         },
 
-        dispose: function (context) {
-            this.propagateDispose(context);
-        },
-
         propagateAssert: function (context) {
             this.__propagate("assertRight", context);
         },
diff --git a/lib/nodes/typeNode.js b/lib/nodes/typeNode.js
index dbcf821..a9a39dc 100644
--- a/lib/nodes/typeNode.js
+++ b/lib/nodes/typeNode.js
@@ -26,11 +26,17 @@ AlphaNode.extend({
             return "TypeNode" + this.__count;
         },
 
-        dispose: function () {
+        // Root passes visited; optional otherwise.
+        dispose: function (visited) {
+            visited = visited || {};
+            if (visited[this.__count]) {
+                return;
+            }
+            visited[this.__count] = true;
             var es = this.__entrySet, i = es.length - 1;
             for (; i >= 0; i--) {
                 var e = es[i], outNode = e.key, paths = e.value;
-                outNode.dispose({paths: paths});
+                outNode.dispose({paths: paths}, visited);
             }
         },
 
diff --git a/mise.lock b/mise.lock
new file mode 100644
index 0000000..3ad85d8
--- /dev/null
+++ b/mise.lock
@@ -0,0 +1,13 @@
+# @generated - this file is auto-generated by `mise lock` https://mise.en.dev/dev-tools/mise-lock.html
+
+[[tools.node]]
+version = "22.22.1"
+backend = "core:node"
+
+[tools.node."platforms.linux-x64"]
+checksum = "sha256:07c8aafa60644fb81adefa1ee7da860eb1920851ffdc9a37020ab0be47fbc10e"
+url = "https://nodejs.org/dist/v22.22.1/node-v22.22.1-linux-x64.tar.gz"
+
+[tools.node."platforms.macos-arm64"]
+checksum = "sha256:679ad4966339e4ef4900f57996714864e4211b898825bb840c3086c419fbcef2"
+url = "https://nodejs.org/dist/v22.22.1/node-v22.22.1-darwin-arm64.tar.gz"
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..08c76bc
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1984 @@
+{
+  "name": "nools",
+  "version": "0.4.4-immuta2",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "nools",
+      "version": "0.4.4-immuta2",
+      "dependencies": {
+        "arguments-extended": "~0.0.3",
+        "array-extended": "~0.0.4",
+        "commander": "^1.1.1",
+        "date-extended": "~0.0.3",
+        "declare.js": "~0.0.3",
+        "extended": "~0.0.3",
+        "function-extended": "~0.0.3",
+        "ht": "~0.0.2",
+        "is-extended": "~0.0.4",
+        "leafy": "~0.0.3",
+        "object-extended": "~0.0.3",
+        "promise-extended": "~0.0.3",
+        "string-extended": "~0.0.3",
+        "uglify-js": "^3.14.3"
+      },
+      "bin": {
+        "nools": "bin/nools"
+      },
+      "devDependencies": {
+        "coddoc": "0.0.3",
+        "grunt": "~0.4.1",
+        "grunt-browserify": "1.2.4",
+        "grunt-contrib-jshint": "~0.5.3",
+        "grunt-contrib-uglify": "~0.2.0",
+        "grunt-exec": "^0.4.5",
+        "grunt-it": "~0.3.0",
+        "it": "~0.2.0",
+        "jison": "~0.4.17"
+      },
+      "engines": {
+        "node": ">= 0.6.1"
+      }
+    },
+    "node_modules/abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha512-S2Hw0TtNkMJhIabBwIojKL9YHO5T0n5eNqWJ7Lrlel/zDbftQpxpapi8tZs3X1HWa+u+QeydGmzzNU0m09+Rcg==",
+      "dev": true,
+      "license": "BSD-3-Clause OR MIT",
+      "engines": {
+        "node": ">=0.4.2"
+      }
+    },
+    "node_modules/argparse": {
+      "version": "0.1.16",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-0.1.16.tgz",
+      "integrity": "sha512-LjmC2dNpdn2L4UzyoaIr11ELYoLn37ZFy9zObrQFHsSuOepeUEMKnM8w5KL4Tnrp2gy88rRuQt6Ky8Bjml+Baw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "underscore": "~1.7.0",
+        "underscore.string": "~2.4.0"
+      }
+    },
+    "node_modules/argparse/node_modules/underscore.string": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-2.4.0.tgz",
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+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/arguments-extended": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/arguments-extended/-/arguments-extended-0.0.3.tgz",
+      "integrity": "sha512-MNYdPKgCiywbgHAmNsYr1tSNLtfbSdwE1akZV+33hU9A8RG0lO5HAK9oMnw7y7bjYUhc04dJpcIBMUaPPYYtXg==",
+      "license": "MIT",
+      "dependencies": {
+        "extended": "~0.0.3",
+        "is-extended": "~0.0.8"
+      }
+    },
+    "node_modules/array-extended": {
+      "version": "0.0.11",
+      "resolved": "https://registry.npmjs.org/array-extended/-/array-extended-0.0.11.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "arguments-extended": "~0.0.3",
+        "extended": "~0.0.3",
+        "is-extended": "~0.0.3"
+      }
+    },
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+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/astw/-/astw-0.0.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esprima": "1.0.2"
+      }
+    },
+    "node_modules/astw/node_modules/esprima": {
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+        "esvalidate": "bin/esvalidate.js"
+      },
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+      }
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+      }
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+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-0.0.2.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/bops": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/bops/-/bops-0.0.6.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "0.0.2",
+        "to-utf8": "0.0.1"
+      }
+    },
+    "node_modules/browser-builtins": {
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+      "resolved": "https://registry.npmjs.org/browser-builtins/-/browser-builtins-1.0.7.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "buffer-browserify": "0.1.x",
+        "console-browserify": "0.1.x",
+        "constants-browserify": "0.0.x",
+        "crypto-browserify": "1.0.x",
+        "http-browserify": "0.1.x",
+        "punycode": "1.2.x",
+        "resolve": "0.3.x",
+        "vm-browserify": "0.0.x",
+        "zlib-browserify": "0.0.x"
+      }
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+      "version": "0.10.2",
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+      "license": "MIT",
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+        "JSONStream": "~0.6.4",
+        "through": "~2.3.4"
+      },
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+      "license": "MIT",
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+      "license": "MIT"
+    },
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+      "resolved": "https://registry.npmjs.org/browserify/-/browserify-2.27.1.tgz",
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+        "browser-pack": "~0.10.0",
+        "browser-resolve": "~1.1.0",
+        "concat-stream": "~1.0.0",
+        "deps-sort": "~0.1.1",
+        "duplexer": "~0.1.1",
+        "event-stream": "~3.0.15",
+        "inherits": "~1.0.0",
+        "insert-module-globals": "~1.2.0",
+        "JSONStream": "~0.6.4",
+        "module-deps": "~1.0.2",
+        "optimist": "~0.5.1",
+        "parents": "~0.0.1",
+        "shell-quote": "~0.0.1",
+        "syntax-error": "~0.0.0",
+        "through": "~2.3.4",
+        "umd": "~1.1.0"
+      },
+      "bin": {
+        "browserify": "bin/cmd.js"
+      }
+    },
+    "node_modules/browserify-shim": {
+      "version": "2.0.10",
+      "resolved": "https://registry.npmjs.org/browserify-shim/-/browserify-shim-2.0.10.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "through": "~2.3.4"
+      },
+      "peerDependencies": {
+        "browserify": ">= 2.3.0 < 4"
+      }
+    },
+    "node_modules/buffer-browserify": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/buffer-browserify/-/buffer-browserify-0.1.0.tgz",
+      "integrity": "sha512-X/ElZKujhD75e83Y8ZkYOx42ryvdsGgsL4dnyPu6/94xSb9sd/dswpYITDrDPzvbUJgFFuc4eFKQ6VMdsrYEDg==",
+      "deprecated": "Package not maintained. Recent browserify uses https://github.com/feross/buffer",
+      "dev": true,
+      "license": "MIT/X11",
+      "dependencies": {
+        "base64-js": "0.0.2"
+      }
+    },
+    "node_modules/callsite": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/callsite/-/callsite-1.0.0.tgz",
+      "integrity": "sha512-0vdNRFXn5q+dtOqjfFtmtlI9N2eVZ7LMyEV2iKC5mEEFvSg/69Ml6b/WU2qF8W1nLRa0wiSrDT3Y5jOHZCwKPQ==",
+      "dev": true,
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/camelcase": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+      "integrity": "sha512-wzLkDa4K/mzI1OSITC+DUyjgIl/ETNHE9QvYgy6J6Jvqyyz4C0Xfd+lQhb19sX2jMpZV4IssUn0VDVmglV+s4g==",
+      "dev": true,
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+}
diff --git a/package.json b/package.json
index 7372b5c..80387c0 100644
--- a/package.json
+++ b/package.json
@@ -67,6 +67,6 @@
     "lib": "lib"
   },
   "engines": {
-    "node": ">= 0.6.1"
+    "node": ">= 22"
   }
 }
diff --git a/readme.md b/readme.md
index aa8897c..5bb28c3 100644
--- a/readme.md
+++ b/readme.md
@@ -2,7 +2,7 @@
 
 C2FO is no longer maintaining this project. Please use accordingly. If you would like to help maintain or take over the project please let us know. 
 
-[![Build Status](https://travis-ci.org/C2FO/nools.png)](https://travis-ci.org/C2FO/nools)
+[![CI](https://github.com/C2FO/nools/actions/workflows/ci.yml/badge.svg)](https://github.com/C2FO/nools/actions/workflows/ci.yml)
 
 [![browser support](https://ci.testling.com/C2FO/nools.png)](https://ci.testling.com/C2FO/nools)
 
diff --git a/test/dispose.memory.test.js b/test/dispose.memory.test.js
new file mode 100644
index 0000000..82dd35f
--- /dev/null
+++ b/test/dispose.memory.test.js
@@ -0,0 +1,499 @@
+"use strict";
+// Regression suite for session.dispose: beta memories, Not/From maps, agenda, working memory.
+var it = require("it"),
+    assert = require("assert"),
+    declare = require("declare.js"),
+    nools = require("../index"),
+    Memory = require("../lib/nodes/misc/memory");
+
+/** DFS from type nodes; picks up beta-like nodes (Not/From are not only in root.joinNodes). */
+function collectBetaLikeNodes(root) {
+    var seen = {};
+    var out = [];
+
+    function visit(n) {
+        if (!n || seen[n.__count]) {
+            return;
+        }
+        seen[n.__count] = true;
+        if (n.leftTuples && n.rightTuples) {
+            out.push(n);
+        }
+        var es = n.__entrySet, i;
+        if (es) {
+            for (i = es.length - 1; i >= 0; i--) {
+                visit(es[i].key);
+            }
+        }
+    }
+
+    var tns = root.typeNodes, j;
+    for (j = tns.length - 1; j >= 0; j--) {
+        visit(tns[j]);
+    }
+    return out;
+}
+
+/** Assert join hashes, tuple stores, and optional Not/From side maps. */
+function assertBetaStoresEmpty(n) {
+    assert.equal(Object.keys(n.leftMemory).length, 0, "leftMemory keys for " + (n.nodeType || n.toString()));
+    assert.equal(Object.keys(n.rightMemory).length, 0, "rightMemory keys");
+    assert.equal(n.leftTuples.length, 0, "leftTuples.length");
+    assert.equal(n.rightTuples.length, 0, "rightTuples.length");
+    if (n.leftTupleMemory) {
+        assert.equal(Object.keys(n.leftTupleMemory).length, 0, "leftTupleMemory");
+    }
+    if (n.fromMemory) {
+        assert.equal(Object.keys(n.fromMemory).length, 0, "fromMemory");
+    }
+}
+
+/** Facts list + agenda rules cleared (public session surface). */
+function assertSessionStoresDisposed(session) {
+    assert.strictEqual(session.workingMemory.facts.head, null, "workingMemory facts list head");
+    assert.strictEqual(session.workingMemory.facts.tail, null);
+    assert.strictEqual(session.workingMemory.facts.length, 0);
+    assert.deepEqual(session.getFacts(), []);
+    assert.deepEqual(session.agenda.rules, {}, "agenda.rules");
+}
+
+/** Wrap session.dispose; count Memory#clear / clearIndexes (left+right per beta). */
+function disposeWithMemorySpies(session) {
+    var originalClear = Memory.prototype.clear;
+    var originalClearIndexes = Memory.prototype.clearIndexes;
+    var clearCount = 0;
+    var clearIndexesCount = 0;
+    Memory.prototype.clear = function () {
+        clearCount++;
+        return originalClear.apply(this, arguments);
+    };
+    Memory.prototype.clearIndexes = function () {
+        clearIndexesCount++;
+        return originalClearIndexes.apply(this, arguments);
+    };
+    try {
+        session.dispose();
+    } finally {
+        Memory.prototype.clear = originalClear;
+        Memory.prototype.clearIndexes = originalClearIndexes;
+    }
+    return { clearCount: clearCount, clearIndexesCount: clearIndexesCount };
+}
+
+/** Flow names registered in this file (deleteFlow in afterAll). */
+var FLOW_NAMES = [
+    "disposeMemJoin",
+    "disposeMemChain",
+    "disposeMemNot",
+    "disposeMemPlainBeta",
+    "disposeMemRefJoin",
+    "disposeMemTwoRules",
+    "disposeMemFrom",
+    "disposeMemExists",
+    "disposeMemExistsFrom",
+    "disposeMemFromNot",
+    "disposeMemOr",
+    "disposeCompileMem",
+    "disposeMemNoMatch",
+    "disposeMemIdempotent",
+    "disposeMemAgenda"
+];
+
+it.describe("session.dispose clears beta memory", function (it) {
+
+    // Compiled + flow() names; must delete or second test run throws “already defined”.
+    it.afterAll(function () {
+        var i = FLOW_NAMES.length;
+        while (--i >= 0) {
+            nools.deleteFlow(FLOW_NAMES[i]);
+        }
+    });
+
+    // Simple join, chains, Not, Beta vs Join, multi-rule.
+    it.describe("core join networks", function (it) {
+
+        // Proves left/right Memory.clear per beta and WM + agenda flush.
+        it.should("invoke Memory#clear / clearIndexes twice per beta-like node (simple join)", function () {
+            var flow = nools.flow("disposeMemJoin", function () {
+                this.rule("r", [[String, "a"], [Number, "n"]], function () {});
+            });
+            var session = flow.getSession("x", 1);
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.length >= 1, "expected at least one join node");
+
+                var spies = disposeWithMemorySpies(session);
+
+                assert.equal(spies.clearCount, betas.length * 2);
+                assert.equal(spies.clearIndexesCount, spies.clearCount, "clear() always calls clearIndexes()");
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+                assertSessionStoresDisposed(session);
+            });
+        });
+
+        // Chained joins: first beta must propagate dispose to downstream betas.
+        it.should("clear every beta-like node in a multi-join rule", function () {
+            var flow = nools.flow("disposeMemChain", function () {
+                this.rule("r", [
+                    [String, "a"],
+                    [String, "b"],
+                    [Number, "n"]
+                ], function () {});
+            });
+            var session = flow.getSession("x", "y", 7);
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.length >= 2, "chained patterns should create multiple joins");
+
+                var spies = disposeWithMemorySpies(session);
+
+                assert.equal(spies.clearCount, betas.length * 2);
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // NotNode.leftTupleMemory is extra state on top of BetaNode disposal.
+        it.should("clear NotNode auxiliary maps and tuple stores", function () {
+            var flow = nools.flow("disposeMemNot", function () {
+                this.rule("order", [
+                    [Number, "n1"],
+                    ["not", Number, "n2", "n1 != n2 && n1 > n2"]
+                ], function () {});
+            });
+            var session = flow.getSession(3, 1, 5, 2, 4);
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.length >= 1);
+                var hasNot = false;
+                var i = betas.length;
+                while (--i >= 0) {
+                    if (betas[i].nodeType === "NotNode") {
+                        hasNot = true;
+                    }
+                }
+                assert.isTrue(hasNot, "fixture should include a NotNode");
+
+                session.dispose();
+
+                i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // No ReferenceConstraint on either pattern side => plain BetaNode (not JoinNode).
+        it.should("clear plain BetaNode networks (no reference constraints on either side)", function () {
+            var flow = nools.flow("disposeMemPlainBeta", function () {
+                this.rule("r", [
+                    [String, "a", "a == 'hi'"],
+                    [String, "b", "b == 'there'"]
+                ], function () {});
+            });
+            var session = flow.getSession("hi", "there");
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.some(function (b) {
+                    return b.nodeType === "BetaNode";
+                }), "expected a plain BetaNode join");
+                session.dispose();
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // Cross-pattern reference => JoinNode; memories must still empty after dispose.
+        it.should("clear JoinNode networks with cross-pattern references", function () {
+            var flow = nools.flow("disposeMemRefJoin", function () {
+                this.rule("r", [
+                    [String, "s1"],
+                    [String, "s2", "s2 == s1"]
+                ], function () {});
+            });
+            var session = flow.getSession("same", "same");
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.some(function (b) {
+                    return b.nodeType === "JoinNode";
+                }), "reference constraints should use JoinNode");
+                session.dispose();
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // Two rules => two alpha subgraphs; every beta in the session graph clears.
+        it.should("clear all join nodes when the flow defines multiple rules", function () {
+            var flow = nools.flow("disposeMemTwoRules", function () {
+                this.rule("a", [[String, "x"], [Number, "n"]], function () {});
+                this.rule("b", [[String, "y"], [Boolean, "b"]], function () {});
+            });
+            var session = flow.getSession("p", 1, "q", true);
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.length >= 2, "two rules should contribute disjoint join subgraphs");
+                var spies = disposeWithMemorySpies(session);
+                assert.equal(spies.clearCount, betas.length * 2);
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+    });
+
+    // FromNode, exists variants, from+not, or-replicated rules, compile() path.
+    it.describe("from / exists / or / compiled flows", function (it) {
+
+        var Address = declare({
+            instance: {
+                constructor: function (zip) {
+                    this.zipcode = zip;
+                }
+            }
+        });
+        var Person = declare({
+            instance: {
+                constructor: function (first, last, address) {
+                    this.firstName = first;
+                    this.lastName = last;
+                    this.address = address;
+                }
+            }
+        });
+
+        // fromMemory fills during match; FromNode.dispose must drop it before super.
+        it.should("clear FromNode fromMemory and tuple stores", function () {
+            var flow = nools.flow("disposeMemFrom", function () {
+                this.rule("fromdispose", [
+                    [Person, "p"],
+                    [Address, "a", "a.zipcode == 88847", "from p.address"]
+                ], function () {});
+            });
+            var session = flow.getSession(new Person("bob", "yukon", new Address(88847)));
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                var hasFrom = false;
+                var i = betas.length;
+                while (--i >= 0) {
+                    if (betas[i].nodeType === "FromNode") {
+                        hasFrom = true;
+                    }
+                }
+                assert.isTrue(hasFrom, "fixture should include FromNode");
+                var fromNodes = betas.filter(function (b) {
+                    return b.nodeType === "FromNode";
+                });
+                assert.ok(Object.keys(fromNodes[0].fromMemory).length > 0, "fromMemory populated before dispose");
+                session.dispose();
+                i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // ExistsNode subclasses NotNode (blocking / leftTupleMemory paths).
+        it.should("clear ExistsNode (extends NotNode) tuple and blocking maps", function () {
+            var C = function () {
+                this.n = 0;
+            };
+            var flow = nools.flow("disposeMemExists", function () {
+                this.rule("ex", [
+                    ["exists", String, "s"],
+                    [C, "c"]
+                ], function () {});
+            });
+            var session = flow.getSession(new C(), "a", "b");
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.some(function (b) {
+                    return b.nodeType === "ExistsNode";
+                }));
+                session.dispose();
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // Exists + from uses ExistsFromNode; inherits fromMemory cleanup from FromNot path.
+        it.should("clear ExistsFromNode fromMemory", function () {
+            function PersonZip(z) {
+                this.zipcodes = z;
+            }
+            var C = function () {
+                this.n = 0;
+            };
+            var flow = nools.flow("disposeMemExistsFrom", function () {
+                this.rule("exf", [
+                    [PersonZip, "p"],
+                    ["exists", Number, "zip", "zip == 11111", "from p.zipcodes"],
+                    [C, "c"]
+                ], function () {});
+            });
+            var session = flow.getSession(new C(), new PersonZip([33333, 22222, 11111]));
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.some(function (b) {
+                    return b.nodeType === "ExistsFromNode";
+                }));
+                session.dispose();
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // not + from collection: FromNotNode keeps fromMemory for generated facts.
+        it.should("clear FromNotNode (not … from …) fromMemory", function () {
+            var FriendPerson = declare({
+                instance: {
+                    constructor: function (first, last, friends) {
+                        this.firstName = first;
+                        this.lastName = last;
+                        this.friends = friends || [];
+                    }
+                }
+            });
+            var flow = nools.flow("disposeMemFromNot", function () {
+                this.rule("fn", [
+                    [FriendPerson, "p"],
+                    ["not", FriendPerson, "friend", "p !== friend && friend.lastName !== p.lastName", "from p.friends"]
+                ], function () {});
+            });
+            var a = new FriendPerson("a", "yuk", []);
+            var b = new FriendPerson("b", "yuko", []);
+            a.friends.push(b);
+            var session = flow.getSession(a, b);
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.some(function (bn) {
+                    return bn.nodeType === "FromNotNode";
+                }));
+                session.dispose();
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // or() clones into multiple rules; session root still owns one combined network walk.
+        it.should("clear networks produced by or patterns (multiple rule replicas)", function () {
+            var Cntr = function () {
+                this.k = 0;
+            };
+            var flow = nools.flow("disposeMemOr", function () {
+                this.rule("orr", [
+                    ["or",
+                        [String, "s", "s == 'hello'"],
+                        [String, "s", "s == 'world'"]
+                    ],
+                    [Cntr, "c"]
+                ], function () {});
+            });
+            var session = flow.getSession("world", new Cntr());
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.length >= 1);
+                session.dispose();
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+            });
+        });
+
+        // compile() flow + getSession: same dispose contract as nools.flow().
+        it.should("dispose compiled DSL flow and clear beta memory", function () {
+            var flow = nools.compile(
+                "rule disposeDsl { when { a: String; b: Number; } then { } }",
+                { name: "disposeCompileMem" }
+            );
+            var session = flow.getSession("z", 9);
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                assert.ok(betas.length >= 1);
+                var spies = disposeWithMemorySpies(session);
+                assert.equal(spies.clearCount, betas.length * 2);
+                assertSessionStoresDisposed(session);
+            });
+        });
+    });
+
+    // Activations and per-rule trees dropped while beta dispose runs separately.
+    it.describe("agenda", function (it) {
+
+        // Fired rule leaves agenda.rules populated; dispose must zero activations.
+        it.should("remove all activations and per-rule agenda bookkeeping", function () {
+            var fired = false;
+            var flow = nools.flow("disposeMemAgenda", function () {
+                this.rule("fires", [[String, "a"]], function () {
+                    fired = true;
+                });
+            });
+            var session = flow.getSession("x");
+            return session.match().then(function () {
+                assert.isTrue(fired);
+                assert.ok(Object.keys(session.agenda.rules).length > 0, "rules registered activations");
+                session.dispose();
+                assert.deepEqual(session.agenda.rules, {});
+                assert.isTrue(session.agenda.isEmpty());
+            });
+        });
+    });
+
+    // No match path, double dispose.
+    it.describe("edge cases and invariants", function (it) {
+
+        // No match run: still safe to dispose (InitialFact cleared with WM).
+        it.should("dispose a session that never ran match()", function () {
+            var flow = nools.flow("disposeMemNoMatch", function () {
+                this.rule("r", [[String, "a"]], function () {});
+            });
+            var session = flow.getSession("only");
+            var betas = collectBetaLikeNodes(session.rootNode);
+            assert.doesNotThrow(function () {
+                session.dispose();
+            });
+            var i = betas.length;
+            while (--i >= 0) {
+                assertBetaStoresEmpty(betas[i]);
+            }
+            assertSessionStoresDisposed(session);
+        });
+
+        // Defensive: callers may invoke dispose more than once.
+        it.should("allow dispose() twice without throwing (idempotent)", function () {
+            var flow = nools.flow("disposeMemIdempotent", function () {
+                this.rule("r", [[String, "a"], [Number, "n"]], function () {});
+            });
+            var session = flow.getSession("q", 3);
+            return session.match().then(function () {
+                var betas = collectBetaLikeNodes(session.rootNode);
+                session.dispose();
+                assert.doesNotThrow(function () {
+                    session.dispose();
+                });
+                var i = betas.length;
+                while (--i >= 0) {
+                    assertBetaStoresEmpty(betas[i]);
+                }
+                assertSessionStoresDisposed(session);
+            });
+        });
+    });
+});
diff --git a/test/flow/from.test.js b/test/flow/from.test.js
index 355945a..1e9a00c 100644
--- a/test/flow/from.test.js
+++ b/test/flow/from.test.js
@@ -139,20 +139,20 @@ it.describe("from condition", function (it) {
 
     it.describe("with js source", function (it) {
 
-        var called = 0;
-
         function MyValue(n2) {
             this.value = n2;
         }
 
-        var flow = nools.flow("from flow js source", function (flow) {
+        // Pin the date fact and the from-clause source to the same value (avoids flake from re-evaluating daysFromNow).
+        var dateFact = dateExtended.daysFromNow(1);
+
+        function addFromJsSourceRules(flow) {
             flow.rule("from rule 1", [
                 [MyValue, "n1"],
                 [Number, "n2", "n1.value == n2", "from [1,2,3,4,5]"]
             ], function (facts) {
                 assert.equal(facts.n1.value, facts.n2);
                 assert.isTrue([1, 2, 3, 4, 5].indexOf(facts.n2) !== -1);
-                called++;
             });
 
             flow.rule("from rule 2", [
@@ -161,16 +161,20 @@ it.describe("from condition", function (it) {
             ], function (facts) {
                 assert.equal(facts.n1.value, facts.n2);
                 assert.isTrue(['a' , 'b', 'c', 'd', 'e', 'f'].indexOf(facts.n2) !== -1);
-                called++;
             });
 
-            flow.rule("from rule 3 with function", [
+            flow.rule("from rule 3 with function", {
+                scope: {
+                    daysFromNow: function () {
+                        return dateFact;
+                    }
+                }
+            }, [
                 [MyValue, "n1", "isDate(n1.value)"],
                 [Date, "n2", "dateCmp(n1.value, n2)", "from daysFromNow(1)"]
             ], function (facts) {
                 assert.isDate(facts.n1.value);
                 assert.isDate(facts.n2);
-                called++;
             });
 
             flow.rule("from rule 4 with scope function", {
@@ -185,12 +189,20 @@ it.describe("from condition", function (it) {
             ], function (facts) {
                 assert.equal(facts.n1.value, facts.n2);
                 assert.isTrue(["f", "g", "h", "i", "j"].indexOf(facts.n2) !== -1);
-                called++;
             });
+        }
+
+        var flow = nools.flow("from flow js source", addFromJsSourceRules);
+
+        // deleteFlows() removes global registration; put this flow back for getSession().
+        it.beforeEach(function () {
+            if (!nools.hasFlow("from flow js source")) {
+                flow = nools.flow("from flow js source", addFromJsSourceRules);
+            }
         });
 
         it.should("create the proper match contexts", function () {
-
+            var fireCount = 0;
             var session = flow.getSession(
                 new MyValue(1),
                 new MyValue(2),
@@ -202,16 +214,18 @@ it.describe("from condition", function (it) {
                 new MyValue('c'),
                 new MyValue('d'),
                 new MyValue('e'),
-                new MyValue(dateExtended.daysFromNow(1)),
+                new MyValue(dateFact),
                 new MyValue('f'),
                 new MyValue('g'),
                 new MyValue('h'),
                 new MyValue('i'),
                 new MyValue('j')
 
-            );
+            ).on("fire", function () {
+                fireCount++;
+            });
             return session.match().then(function () {
-                assert.equal(called, 16);
+                assert.equal(fireCount, 16);
             });
         });
 
diff --git a/test/issues.test.js b/test/issues.test.js
index 2b27c2a..55bc5a1 100644
--- a/test/issues.test.js
+++ b/test/issues.test.js
@@ -1,10 +1,104 @@
 "use strict";
 var it = require("it"),
     assert = require("assert"),
-    nools = require("../index");
+    nools = require("../index"),
+    GraphNode = require("../lib/nodes/node");
 
 it.describe("issues", function (it) {
 
+    // Node.dispose visited map: cycles and diamonds must not blow the stack.
+    it.describe("dispose shared graph", function (it) {
+
+        // Smoke: 2-node cycle must terminate (stack overflow = bug).
+        it.should("not recurse infinitely when dispose encounters a directed cycle through shared nodes", function () {
+            var a = new GraphNode(),
+                b = new GraphNode(),
+                pattern = {}
+            ;
+            a.addOutNode(b, pattern);
+            b.addOutNode(a, pattern);
+            assert.doesNotThrow(function () {
+                a.dispose();
+            });
+        });
+
+        // External visited map: each node exactly once in a large ring.
+        it.should("visit each node in a large directed cycle once (visited map matches graph size)", function () {
+            var n = 250,
+                nodes = [],
+                pattern = {},
+                i
+            ;
+            for (i = 0; i < n; i++) {
+                nodes.push(new GraphNode());
+            }
+            for (i = 0; i < n; i++) {
+                nodes[i].addOutNode(nodes[(i + 1) % n], pattern);
+            }
+            var visited = {};
+            nodes[0].dispose(undefined, visited);
+            assert.equal(Object.keys(visited).length, n);
+            for (i = 0; i < n; i++) {
+                assert.isTrue(visited[nodes[i].__count], "node index " + i + " __count " + nodes[i].__count);
+            }
+        });
+
+        // Wrapper counts entries: ring closure causes one extra call that hits visited[] and returns.
+        it.should("short-circuit when dispose re-enters a node (visited prevents unbounded recursion)", function () {
+            var n = 100,
+                nodes = [],
+                pattern = {},
+                i,
+                originalDispose = GraphNode.prototype.dispose,
+                entries = {}
+            ;
+            GraphNode.prototype.dispose = function (assertable, visited) {
+                var c = this.__count;
+                entries[c] = (entries[c] || 0) + 1;
+                return originalDispose.call(this, assertable, visited);
+            };
+            try {
+                for (i = 0; i < n; i++) {
+                    nodes.push(new GraphNode());
+                }
+                for (i = 0; i < n; i++) {
+                    nodes[i].addOutNode(nodes[(i + 1) % n], pattern);
+                }
+                nodes[0].dispose();
+                var totalCalls = Object.keys(entries).reduce(function (acc, k) {
+                    return acc + entries[k];
+                }, 0);
+                assert.equal(totalCalls, n + 1, "one extra dispose entry when the cycle closes; without visited this never finishes");
+                assert.equal(entries[nodes[0].__count], 2, "start node is entered again and must return immediately");
+                for (i = 1; i < n; i++) {
+                    assert.equal(entries[nodes[i].__count], 1);
+                }
+            } finally {
+                GraphNode.prototype.dispose = originalDispose;
+            }
+        });
+
+        // RootNode-style: two type trees, one visited object; self-edge on shared node.
+        it.should("mark every reachable node when two roots share one visited map (like RootNode.dispose)", function () {
+            var pattern = {},
+                a = new GraphNode(),
+                b = new GraphNode(),
+                shared = new GraphNode()
+            ;
+            a.addOutNode(shared, pattern);
+            b.addOutNode(shared, pattern);
+            shared.addOutNode(shared, pattern);
+            var visited = {};
+            a.dispose(undefined, visited);
+            b.dispose(undefined, visited);
+            assert.equal(Object.keys(visited).length, 3);
+            assert.isTrue(visited[a.__count]);
+            assert.isTrue(visited[b.__count]);
+            assert.isTrue(visited[shared.__count]);
+        });
+
+    });
+
     it.describe("62", function (it) {
         it.should("allow rule names with \" character in constraints", function () {
             assert.isTrue(/"s == \\"hello\\""/.test(nools.transpile('rule "issue62" {when {s : String s == "hello";}then {emit("s", s);}}', {name: "issue62"})));