ci(spark): adopt estate SPARK Theatre Gate (#135)

[hyperpolymath]

Thin caller of the reusable hyperpolymath/standards SPARK Theatre Gate, pinned to the #141 merge commit 462003782f3ebb93ea763e81d0d199ce13ef7d73 per the estate action-pinning policy. Makes anti-theatre enforcement live here.

Refs hyperpolymath/standards#124
Refs hyperpolymath/standards#135

[github-actions]

🔍 Hypatia Security Scan

Findings: 189 issues detected

Severity	Count
🔴 Critical	36
🟠 High	77
🟡 Medium	76

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "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 haskell-actions/setup@v2 needs attention",
    "type": "unpinned_action",
    "file": "agda-meta-checker.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/cache@v4 needs attention",
    "type": "unpinned_action",
    "file": "agda-meta-checker.yml",
    "action": "pin_sha",
    "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": "Action hyperpolymath/panic-attack/.github/workflows/scan-and-report.yml@main needs attention",
    "type": "unpinned_action",
    "file": "security-scan.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": "believe_me undermines formal verification (1 occurrences, CWE-704)",
    "type": "believe_me",
    "file": "/home/runner/work/echidna/echidna/src/abi/TypeLLForeign.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "believe_me undermines formal verification (2 occurrences, CWE-704)",
    "type": "believe_me",
    "file": "/home/runner/work/echidna/echidna/src/abi/CoprocessorForeign.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
    "type": "believe_me",
    "file": "/home/runner/work/echidna/echidna/src/abi/Overlay.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  }
]

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