ci: add canonical hypatia-scan.yml (missing — estate uniformity)

[hyperpolymath]

This repo had no hypatia-scan.yml; adding the canonical 413-line workflow so it carries the estate security scan like all other repos. hyperpolymath/standards#87.

[github-actions]

🔍 Hypatia Security Scan

Findings: 19 issues detected

Severity	Count
🔴 Critical	0
🟠 High	8
🟡 Medium	11

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/vcs-ircd/vcs-ircd",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "Issue in quality.yml",
    "type": "missing_workflow",
    "file": "quality.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in security-policy.yml",
    "type": "missing_workflow",
    "file": "security-policy.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Workflow executes remote script directly (curl/wget piped to shell). Download, verify checksum/signature, then execute.",
    "type": "download_then_run",
    "file": "mirror.yml",
    "action": "verify_download_integrity",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "codeql.yml lists `language: javascript-typescript` but the repo has no source files in any CodeQL-scannable language. The analyze job will exit 'no source files' on every run. Switch the matrix to `actions` (which scans workflow files — every repo has those).",
    "type": "codeql_language_matrix_mismatch",
    "file": "codeql.yml",
    "action": "switch_codeql_matrix_to_actions",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Obj.magic bypassing type safety (2 occurrences, CWE-704)",
    "type": "obj_magic",
    "file": "/home/runner/work/vcs-ircd/vcs-ircd/vext-tools/src/bindings/Std.res",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Obj.magic bypassing type safety (1 occurrences, CWE-704)",
    "type": "obj_magic",
    "file": "/home/runner/work/vcs-ircd/vcs-ircd/vext-tools/src/hooks/Git.res",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Js.Nullable deprecated -- use Nullable (1 occurrences)",
    "type": "deprecated_api",
    "file": "/home/runner/work/vcs-ircd/vcs-ircd/vext-tools/src/bindings/Deno.res",
    "action": "module_replace",
    "rule_module": "migration_rules",
    "severity": "medium"
  },
  {
    "reason": "Js.Dict deprecated -- use Dict (4 occurrences)",
    "type": "deprecated_api",
    "file": "/home/runner/work/vcs-ircd/vcs-ircd/vext-tools/src/bindings/Std.res",
    "action": "module_replace",
    "rule_module": "migration_rules",
    "severity": "high"
  }
]

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