chore(ci): replace mirror.yml with reusable wrapper

[hyperpolymath]

Summary

Replaces this repo's full mirror.yml (~145 lines, drift-prone) with a thin ~13-line wrapper that calls hyperpolymath/standards/.github/workflows/mirror-reusable.yml@e6b2884722350515934d443daf23442f2195796f (merged via standards#187).

Forge selection (GitLab, Bitbucket, Codeberg, SourceHut, Disroot, Gitea, Radicle) remains gated by Actions vars.<FORGE>_MIRROR_ENABLED exactly as before. secrets: inherit flows the per-forge SSH keys through implicitly.

Why

Estate audit: 289 mirror.yml deployments across the org, 75 unique blob SHAs (76% drift). Drift is action-SHA pin churn, not feature variance — the canonical 7-forge job set is identical across sampled variants. Converging behind the reusable cuts ~94k LOC of estate scaffold and means future changes to mirror logic propagate via one SHA bump.

Part of estate-wide convergence campaign 2026-05-26 (standards#199 / #187).

[github-actions]

🔍 Hypatia Security Scan

Findings: 47 issues detected

Severity	Count
🔴 Critical	2
🟠 High	28
🟡 Medium	17

⚠️ Action Required: Critical security issues found!

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": "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": "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": "unwrap_or(0) with dangerous default (1 occurrences, CWE-754)",
    "type": "unwrap_dangerous_default",
    "file": "/home/runner/work/docmatrix/docmatrix/crates/formatrix-db/src/lib.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "from_raw constructs types from raw pointers without safety checks (2 occurrences, CWE-676)",
    "type": "from_raw",
    "file": "/home/runner/work/docmatrix/docmatrix/crates/formatrix-core/src/ffi.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "as_ptr exposes raw pointer that may dangle or alias unsafely (8 occurrences, CWE-676)",
    "type": "as_ptr",
    "file": "/home/runner/work/docmatrix/docmatrix/crates/formatrix-core/src/ffi.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "unwrap() without prior check -- DoS via panic (2 occurrences, CWE-754)",
    "type": "unwrap_without_check",
    "file": "/home/runner/work/docmatrix/docmatrix/crates/formatrix-core/src/formats/djot.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "unwrap_or(0) with dangerous default (1 occurrences, CWE-754)",
    "type": "unwrap_dangerous_default",
    "file": "/home/runner/work/docmatrix/docmatrix/crates/formatrix-core/src/formats/orgmode.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "unwrap() without prior check -- DoS via panic (1 occurrences, CWE-754)",
    "type": "unwrap_without_check",
    "file": "/home/runner/work/docmatrix/docmatrix/crates/formatrix-core/benches/format_bench.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Nominal-only SAST in docmatrix: 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/docmatrix/docmatrix",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Add CodeQL or equivalent SAST workflow.",
    "scorecard_check": "SAST"
  }
]

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