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: 34 issues detected

Severity	Count
🔴 Critical	2
🟠 High	8
🟡 Medium	24

⚠️ 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/upload-artifact@v4 needs attention",
    "type": "unpinned_action",
    "file": "release.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/download-artifact@v4 needs attention",
    "type": "unpinned_action",
    "file": "release.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "expect() in hot path (2 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/atsiser/atsiser/src/codegen/parser.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "unwrap_or(0) with dangerous default (1 occurrences, CWE-754)",
    "type": "unwrap_dangerous_default",
    "file": "/home/runner/work/atsiser/atsiser/src/codegen/ats_gen.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "line": 24,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/atsiser/atsiser/.envrc",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "reason": "Nominal-only SAST in atsiser: codeql.yml language matrix contains no language present in the repo and lacks `actions`, so CodeQL records zero results on every commit. Remediation: set the CodeQL matrix to `language: actions`.",
    "type": "StaticAnalysis",
    "file": "/home/runner/work/atsiser/atsiser",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Add CodeQL or equivalent SAST workflow.",
    "scorecard_check": "SAST"
  },
  {
    "reason": "1 workflow(s) with tag-pinned (not SHA-pinned) actions in atsiser",
    "type": "DependencyPinning",
    "file": "/home/runner/work/atsiser/atsiser",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Pin GitHub Actions and Docker base images by SHA hash.",
    "scorecard_check": "Pinned-Dependencies"
  },
  {
    "reason": "Repository has 2 non-main remote branch(es). Policy: single main branch only.",
    "type": "GS007",
    "file": ".",
    "action": "delete_remote_branches",
    "rule_module": "git_state",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/code_safety/unwrap_dangerous_default -- Hypatia code_safety: unwrap_dangerous_default -- 3 day(s) old",
    "type": "CSA001",
    "file": "src/codegen/ats_gen.rs",
    "action": "update",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  }
]

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