fix(ci): re-pin rust-ci-reusable past toolchain-input breakage

[hyperpolymath]

Re-pins rust-ci-reusable.yml from d135b05bfc647d0c0fbfedc7e80f37ea50f49236 (pre-fix) to 412a7031577112b31ee287cc6060179d638d6500 (standards main).

Why: the old SHA predates standards#439. Under a SHA-pinned dtolnay/rust-toolchain, the toolchain input is mandatory; without it all four rust-ci jobs (check/test/audit/coverage) fail immediately with 'toolchain' is a required input — an estate-wide Rust CI breakage. This PR restores green here.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 52 issues detected

Severity	Count
🔴 Critical	0
🟠 High	35
🟡 Medium	17

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/docmatrix/docmatrix",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "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": "Issue in push-email-notify.yml",
    "type": "missing_timeout_minutes",
    "file": "push-email-notify.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in instant-sync.yml",
    "type": "secret_action_without_presence_gate",
    "file": "instant-sync.yml",
    "action": "peter-evans/repository-dispatch",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "secret_action_without_presence_gate",
    "file": "mirror.yml",
    "action": "webfactory/ssh-agent",
    "rule_module": "workflow_audit",
    "severity": "high"
  }
]

Powered by Hypatia Neurosymbolic CI/CD Intelligence