test(ffi): hexadeca-connector golden fixture + tri-language drift guard

[hyperpolymath]

Closes the one drift-surface in the hexadeca-connector wire contract. The Zig enum, Idris2 ABI, and Rust client mirror the same 16 connectors, but agreement rested on three independent test suites each pinning the same constants — and the Idris connectorCount = Refl proof pins the count (16), not the ordering. A silent re-order updated in two of three mirrors would slip through.

Adds a single oracle:

• ffi/connectors.json — golden source-of-truth (16 × {id, name}, in wire order).
• test/hexadeca_contract_test.exs — reads the golden plus all three source files (hexadeca.zig, Types.idr, connector.rs) and asserts each mirror matches in name and order, and that ids are sequential 0–15.

Runs under the existing mix test (uses Jason — already a dep; no new workflow). A drift in any one mirror now fails CI instead of silently breaking the wire. Verified by hand that all three are currently in lockstep, so this should land green.

Part 1 of 2 from the hexadeca review; the doc pass (16-connector surface + the transaction-based-ephemerality model into the README/6a2) follows separately.

https://claude.ai/code/session_016R5WsMHtpnD8bmrkjFNFmg

[github-actions]

🔍 Hypatia Security Scan

Findings: 42 issues detected

Severity	Count
🔴 Critical	0
🟠 High	0
🟡 Medium	42

View findings

[
  {
    "reason": "Repository has 5 non-main remote branch(es). Policy: single main branch only.",
    "type": "GS007",
    "file": ".",
    "action": "delete_remote_branches",
    "rule_module": "git_state",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "src/ui/gossamer/README.adoc",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "scripts/ci-tools/Cargo.toml",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "scripts/bench-tools/Cargo.toml",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "ffi/zig/README.adoc",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "docs/reports/audit/audit-2026-04-15-post.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "docs/integration/github-registry.adoc",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "docs/integration/github-registry.adoc",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "docs/integration/a2ml-k9.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD022 -- Hypatia structural_drift: SD022 -- 15 day(s) old",
    "type": "CSA001",
    "file": "docs/architecture/system-integration.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  }
]

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