fix(ci): SHA-pin actions/cache (org policy)

[hyperpolymath]

Pins actions/cache@v5 to a full commit SHA; the org policy gate rejects tag pins, failing the build check.

[github-actions]

🔍 Hypatia Security Scan

Findings: 60 issues detected

Severity	Count
🔴 Critical	2
🟠 High	20
🟡 Medium	38

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Required file missing",
    "type": "missing",
    "file": "0-AI-MANIFEST.a2ml",
    "action": "create",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/project-wharf/project-wharf",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "Issue in scorecard.yml",
    "type": "missing_workflow",
    "file": "scorecard.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "missing_workflow",
    "file": "mirror.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action github/codeql-action/init@v4.36.1 needs attention",
    "type": "unpinned_action",
    "file": "codeql.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action github/codeql-action/analyze@v4.36.1 needs attention",
    "type": "unpinned_action",
    "file": "codeql.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "No permissions declaration -- add permissions: read-all",
    "type": "missing_permissions",
    "file": "codeql.yml",
    "action": "add_permissions",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "No permissions declaration -- add permissions: read-all",
    "type": "missing_permissions",
    "file": "generator-generic-ossf-slsa3-publish.yml",
    "action": "add_permissions",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "No permissions declaration -- add permissions: read-all",
    "type": "missing_permissions",
    "file": "rust.yml",
    "action": "add_permissions",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cargo-audit.yml",
    "type": "missing_timeout_minutes",
    "file": "cargo-audit.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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