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: 40 issues detected

Severity	Count
🔴 Critical	2
🟠 High	12
🟡 Medium	26

⚠️ 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": "Python file detected -- banned language",
    "type": "banned_language_file",
    "file": "/home/runner/work/julianiser/julianiser/examples/data-pipeline/pipeline.py",
    "action": "flag",
    "rule_module": "cicd_rules",
    "severity": "critical"
  },
  {
    "reason": "expect() in hot path (96 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/julianiser/julianiser/src/codegen/benchmark.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "expect() in hot path (1 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/julianiser/julianiser/src/codegen/parser.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "Download-and-execute pattern (curl|wget pipe to shell) -- verify integrity before execution (3 occurrences, CWE-494)",
    "type": "shell_download_then_run",
    "file": "/home/runner/work/julianiser/julianiser/setup.sh",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Zig @ptrCast performs unchecked pointer type conversion (3 occurrences, CWE-704)",
    "type": "zig_ptr_cast",
    "file": "/home/runner/work/julianiser/julianiser/src/interface/ffi/src/main.zig",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Zig @alignCast performs unchecked alignment cast (2 occurrences, CWE-704)",
    "type": "zig_align_cast",
    "file": "/home/runner/work/julianiser/julianiser/src/interface/ffi/src/main.zig",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "line": 24,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/julianiser/julianiser/.envrc",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  }
]

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