diff --git a/src/commands/plugin.rs b/src/commands/plugin.rs
index 2ba19593..a576a797 100644
--- a/src/commands/plugin.rs
+++ b/src/commands/plugin.rs
@@ -409,13 +409,7 @@ fn update(name: Option<String>, yes: bool) -> Result<()> {
 
             match status {
                 Ok(s) if s.success() => {
-                    registry::install_plugin(
-                        &pl.name,
-                        std::path::Path::new(&pl.path),
-                        &pl.source,
-                        &pl.starforge_version,
-                        &pl.plugin_version,
-                    )?;
+                    registry::install_plugin(&pl.name, std::path::Path::new(&pl.path), &pl.source, &pl.starforge_version, &pl.plugin_version)?;
                     p::success(&format!("  '{}' updated via cargo install", pl.name));
                     updated += 1;
                 }
@@ -447,7 +441,7 @@ fn update(name: Option<String>, yes: bool) -> Result<()> {
                         })
                         .unwrap_or(0);
 
-                    let installed_epoch = 0;
+                    let installed_epoch = 0u64;
 
                     if modified > installed_epoch {
                         // Library on disk is newer — refresh the registry entry.
diff --git a/src/utils/templates.rs b/src/utils/templates.rs
index 38e38788..2a3911e6 100644
--- a/src/utils/templates.rs
+++ b/src/utils/templates.rs
@@ -1991,4 +1991,175 @@ mod tests {
         ));
         assert!(assert_template_compatible(&entry).is_err());
     }
+
+    // ── parse_semver edge cases ────────────────────────────────────────────────
+
+    #[test]
+    fn parse_semver_large_numbers() {
+        assert_eq!(parse_semver("999.0.0"), Ok((999, 0, 0)));
+        assert_eq!(parse_semver("0.0.999999"), Ok((0, 0, 999999)));
+    }
+
+    #[test]
+    fn parse_semver_rejects_single_component() {
+        assert!(parse_semver("1").is_err());
+    }
+
+    #[test]
+    fn parse_semver_rejects_two_components() {
+        assert!(parse_semver("1.2").is_err());
+    }
+
+    #[test]
+    fn parse_semver_rejects_extra_dots() {
+        assert!(parse_semver("1.2.3.4").is_err(), "four components should fail");
+    }
+
+    #[test]
+    fn parse_semver_rejects_whitespace() {
+        assert!(parse_semver(" 1.2.3").is_err());
+        assert!(parse_semver("1.2.3 ").is_err());
+        assert!(parse_semver("1. 2.3").is_err());
+    }
+
+    #[test]
+    fn parse_semver_rejects_negative_component() {
+        // A leading '-' makes the component non-numeric.
+        assert!(parse_semver("1.-2.3").is_err());
+    }
+
+    #[test]
+    fn parse_semver_rejects_alpha_component() {
+        assert!(parse_semver("1.2.alpha").is_err());
+        assert!(parse_semver("v1.2.3").is_err());
+    }
+
+    // ── check_version_range payload verification ───────────────────────────────
+
+    #[test]
+    fn check_version_range_too_old_carries_correct_payload() {
+        let result = check_version_range("0.0.9", Some("0.1.0"), None);
+        match result {
+            CompatibilityStatus::TooOld {
+                required_min,
+                running,
+            } => {
+                assert_eq!(required_min, "0.1.0");
+                assert_eq!(running, "0.0.9");
+            }
+            other => panic!("expected TooOld, got {:?}", other),
+        }
+    }
+
+    #[test]
+    fn check_version_range_too_new_carries_correct_payload() {
+        let result = check_version_range("2.0.0", None, Some("1.99.99"));
+        match result {
+            CompatibilityStatus::TooNew {
+                required_max,
+                running,
+            } => {
+                assert_eq!(required_max, "1.99.99");
+                assert_eq!(running, "2.0.0");
+            }
+            other => panic!("expected TooNew, got {:?}", other),
+        }
+    }
+
+    #[test]
+    fn check_version_range_exact_min_boundary_is_compatible() {
+        // version == min should be Compatible, not TooOld.
+        assert_eq!(
+            check_version_range("1.0.0", Some("1.0.0"), None),
+            CompatibilityStatus::Compatible
+        );
+    }
+
+    #[test]
+    fn check_version_range_exact_max_boundary_is_compatible() {
+        // version == max should be Compatible, not TooNew.
+        assert_eq!(
+            check_version_range("1.0.0", None, Some("1.0.0")),
+            CompatibilityStatus::Compatible
+        );
+    }
+
+    #[test]
+    fn check_version_range_min_only_above_min_is_compatible() {
+        assert_eq!(
+            check_version_range("1.2.0", Some("1.0.0"), None),
+            CompatibilityStatus::Compatible
+        );
+    }
+
+    #[test]
+    fn check_version_range_max_only_below_max_is_compatible() {
+        assert_eq!(
+            check_version_range("0.9.0", None, Some("1.0.0")),
+            CompatibilityStatus::Compatible
+        );
+    }
+
+    #[test]
+    fn check_version_range_malformed_running_version_is_error() {
+        // The running version itself being malformed should yield MalformedMetadata.
+        let result = check_version_range("not-a-version", Some("0.1.0"), None);
+        assert!(matches!(
+            result,
+            CompatibilityStatus::MalformedMetadata { .. }
+        ));
+    }
+
+    #[test]
+    fn check_version_range_malformed_max_carries_reason() {
+        let result = check_version_range("0.1.0", None, Some("1.x.0"));
+        match result {
+            CompatibilityStatus::MalformedMetadata { reason } => {
+                assert!(!reason.is_empty(), "reason should not be empty");
+            }
+            other => panic!("expected MalformedMetadata, got {:?}", other),
+        }
+    }
+
+    // ── assert_template_compatible error message content ──────────────────────
+
+    #[test]
+    fn assert_template_compatible_too_old_message_contains_min_and_running() {
+        let mut entry = make_entry("future-tpl");
+        let (major, _, _) = parse_semver(CLI_VERSION).unwrap();
+        let min = format!("{}.0.0", major + 100);
+        entry.cli_version_min = Some(min.clone());
+        let err = assert_template_compatible(&entry).unwrap_err();
+        let msg = err.to_string();
+        assert!(msg.contains(&min), "error should contain required_min");
+        assert!(msg.contains(CLI_VERSION), "error should contain running version");
+        assert!(msg.contains("future-tpl"), "error should contain template name");
+    }
+
+    #[test]
+    fn assert_template_compatible_too_new_message_contains_max_and_running() {
+        let mut entry = make_entry("old-tpl");
+        let (major, minor, _) = parse_semver(CLI_VERSION).unwrap();
+        if major > 0 || minor > 0 {
+            entry.cli_version_max = Some("0.0.0".to_string());
+            let err = assert_template_compatible(&entry).unwrap_err();
+            let msg = err.to_string();
+            assert!(msg.contains("0.0.0"), "error should contain required_max");
+            assert!(msg.contains(CLI_VERSION), "error should contain running version");
+            assert!(msg.contains("old-tpl"), "error should contain template name");
+        }
+    }
+
+    #[test]
+    fn assert_template_compatible_malformed_message_contains_reason() {
+        let mut entry = make_entry("broken-tpl");
+        entry.cli_version_min = Some("bad-version".to_string());
+        let err = assert_template_compatible(&entry).unwrap_err();
+        let msg = err.to_string();
+        assert!(msg.contains("broken-tpl"), "error should contain template name");
+        assert!(
+            msg.contains("malformed") || msg.contains("bad-version"),
+            "error should describe the problem"
+        );
+    }
 }