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: 34 issues detected

Severity	Count
🔴 Critical	0
🟠 High	18
🟡 Medium	16

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": "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": "binary_to_term without :safe option -- deserialization attack (1 occurrences, CWE-502)",
    "type": "elixir_send_unsanitised",
    "file": "/home/runner/work/chimichanga/chimichanga/lib/munition/forensics/dump.ex",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "unsafe block -- requires SAFETY comment (10 occurrences, CWE-676)",
    "type": "unsafe_block",
    "file": "/home/runner/work/chimichanga/chimichanga/test_wasm/src/lib.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "Nominal-only SAST in chimichanga: 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/chimichanga/chimichanga",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Add CodeQL or equivalent SAST workflow.",
    "scorecard_check": "SAST"
  },
  {
    "reason": "Repository has 6 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 (Scorecard): TokenPermissionsID -- Token-Permissions -- 0 day(s) old",
    "type": "CSA001",
    "file": ".github/workflows/hypatia-scan.yml",
    "action": "update",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Scorecard): PinnedDependenciesID -- Pinned-Dependencies -- 7 day(s) old",
    "type": "CSA001",
    "file": ".github/workflows/governance.yml",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/workflow_audit/codeql_language_matrix_mismatch -- Hypatia workflow_audit: codeql_language_matrix_mismatch -- 7 day(s) old",
    "type": "CSA001",
    "file": "codeql.yml",
    "action": "update",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD009 -- Hypatia structural_drift: SD009 -- 8 day(s) old",
    "type": "CSA001",
    "file": "ffi/zig/src/main.zig",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  }
]

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