fix(ci): adopt canonical hypatia-scan.yml

[hyperpolymath]

Estate sweep (verisimiser#102 cascade): replace drifted hypatia-scan.yml with the fixed canonical — corrects the env.HOME workdir / old scanner layout drift AND adds pull-requests:write + Comment-step continue-on-error so the advisory PR comment never hard-fails the Hypatia check (hypatia#213). Mechanical, verified green on verisimiser main.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

[github-actions]

🔍 Hypatia Security Scan

Findings: 7 issues detected

Severity	Count
🔴 Critical	1
🟠 High	1
🟡 Medium	5

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Action actions/upload-artifact@v4 needs attention",
    "type": "unpinned_action",
    "file": "release.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/download-artifact@v4 needs attention",
    "type": "unpinned_action",
    "file": "release.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "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"
  },
  {
    "line": 24,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/a2mliser/a2mliser/.envrc",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "reason": "1 workflow(s) with tag-pinned (not SHA-pinned) actions in a2mliser",
    "type": "DependencyPinning",
    "file": "/home/runner/work/a2mliser/a2mliser",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Pin GitHub Actions and Docker base images by SHA hash.",
    "scorecard_check": "Pinned-Dependencies"
  },
  {
    "reason": "Repository has 2 non-main remote branch(es). Policy: single main branch only.",
    "type": "GS007",
    "file": ".",
    "action": "delete_remote_branches",
    "rule_module": "git_state",
    "severity": "medium"
  },
  {
    "reason": "Source file missing SPDX-License-Identifier header",
    "type": "SD009",
    "file": "src/interface/ffi/src/main.zig",
    "action": "add_spdx_header",
    "rule_module": "structural_drift",
    "severity": "medium"
  }
]

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