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: 21 issues detected

Severity	Count
🔴 Critical	1
🟠 High	9
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Required file missing",
    "type": "missing",
    "file": "SECURITY.md",
    "action": "create",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "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": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action Swatinem/rust-cache@v2 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action dtolnay/rust-toolchain@master needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action Swatinem/rust-cache@v2 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.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"
  }
]

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