ci(rust): convert rust-ci.yml to thin wrapper (standards#174)

[hyperpolymath]

Summary

Replaces the per-repo rust-ci.yml copy with a 5-line wrapper invoking the shared reusable workflow filed in standards#174.

Pinned to that PR's HEAD SHA (4fdf4314b4ab54269adbaff10e30e483b5e86845); will resolve to standards/main once #174 merges.

Why

Estate audit found ~87 rust-ci.yml copies across the estate with significant drift. Converting each to a 5-line wrapper means future Rust CI changes propagate in one place.

This PR is part of the foundational sweep following the established standards#168 precedent (governance-reusable + absolute-zero#41 + tma-mark2#41 wrappers).

Variant: trivial ("baseline check + clippy + fmt + test")

Test plan

• CI: rust-ci job invokes the reusable and reports the same checks
• Awaiting standards#174 merge before this becomes useful long-term (still works today via SHA pin)

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 75 issues detected

Severity	Count
🔴 Critical	12
🟠 High	47
🟡 Medium	16

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "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": "release.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action softprops/action-gh-release@v2 needs attention",
    "type": "unpinned_action",
    "file": "release.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "No permissions declaration -- add permissions: read-all",
    "type": "missing_permissions",
    "file": "release.yml",
    "action": "add_permissions",
    "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": "Agda postulate assumes without proof -- potential soundness hole (1 occurrences, CWE-704)",
    "type": "agda_postulate",
    "file": "/home/runner/work/snifs/snifs/verification/proofs/agda/Properties.agda",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "Admitted leaves proof hole (1 occurrences, CWE-704)",
    "type": "admitted",
    "file": "/home/runner/work/snifs/snifs/verification/proofs/coq/TypeSafety.v",
    "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/snifs/snifs/verification/proofs/idris2/Types.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "assert_total bypasses totality checker (1 occurrences, CWE-704)",
    "type": "assert_total",
    "file": "/home/runner/work/snifs/snifs/verification/proofs/idris2/Types.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
    "type": "believe_me",
    "file": "/home/runner/work/snifs/snifs/verification/proofs/idris2/ABI/Pointers.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  }
]

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