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: 85 issues detected

Severity	Count
🔴 Critical	11
🟠 High	43
🟡 Medium	31

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Stale AI task file -- delete or move to docs/",
    "type": "stale",
    "file": "SONNET-TASKS.md",
    "action": "delete",
    "rule_module": "root_hygiene",
    "severity": "high"
  },
  {
    "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": "Workflow executes remote script directly (curl/wget piped to shell). Download, verify checksum/signature, then execute.",
    "type": "download_then_run",
    "file": "echidnabot.yml",
    "action": "verify_download_integrity",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Admitted leaves proof hole (2 occurrences, CWE-704)",
    "type": "admitted",
    "file": "/home/runner/work/echidnabot/echidnabot/proofs/coq/admitted_stub.v",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "Coq admit tactic leaves goal unproven (1 occurrences, CWE-704)",
    "type": "coq_admit_tactic",
    "file": "/home/runner/work/echidnabot/echidnabot/proofs/coq/admitted_stub.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/echidnabot/echidnabot/src/abi/Foreign.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "sorry leaves proof hole (3 occurrences, CWE-704)",
    "type": "sorry",
    "file": "/home/runner/work/echidnabot/echidnabot/proofs/lean/sorry_stub.lean",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "User-defined axiom -- not verified by Lean kernel (1 occurrences, CWE-704)",
    "type": "lean_axiom",
    "file": "/home/runner/work/echidnabot/echidnabot/proofs/lean/sorry_stub.lean",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "Nickel file missing SPDX-License-Identifier header (1 occurrences, CWE-1104)",
    "type": "ncl_missing_spdx",
    "file": "/home/runner/work/echidnabot/echidnabot/.machine_readable/contractiles/intend/intend.ncl",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "Nickel file missing SPDX-License-Identifier header (1 occurrences, CWE-1104)",
    "type": "ncl_missing_spdx",
    "file": "/home/runner/work/echidnabot/echidnabot/.machine_readable/contractiles/bust/bust.ncl",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  }
]

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