ci(codeql): cron weekly→monthly (cut 3, standards#288)

[hyperpolymath]

Per standards#286 canonical (cut 3, Option B). PR-trigger runs unchanged.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 65 issues detected

Severity	Count
🔴 Critical	0
🟠 High	7
🟡 Medium	58

View findings

[
  {
    "reason": "Backup file in root",
    "type": "stale",
    "file": "META.scm.bak",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "medium"
  },
  {
    "reason": "Backup file in root",
    "type": "stale",
    "file": "ECOSYSTEM.scm.bak",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "medium"
  },
  {
    "reason": "Merge artifact in root",
    "type": "stale",
    "file": "SPEC.core.scm.orig",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "medium"
  },
  {
    "reason": "Action perpolymath/standards/.github/workflows/governance-reusable.yml@main\n needs attention",
    "type": "unpinned_action",
    "file": "governance.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"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "missing_timeout_minutes",
    "file": "codeql.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dependabot-automerge.yml",
    "type": "missing_timeout_minutes",
    "file": "dependabot-automerge.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "missing_timeout_minutes",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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