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: 62 issues detected

Severity	Count
🔴 Critical	6
🟠 High	37
🟡 Medium	19

⚠️ 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"
  },
  {
    "line": 57,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/thejeffparadox/thejeffparadox/docs/wiki/Getting-Started.md",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "line": 58,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/thejeffparadox/thejeffparadox/docs/wiki/Getting-Started.md",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "line": 61,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/thejeffparadox/thejeffparadox/docs/wiki/Getting-Started.md",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "line": 59,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/thejeffparadox/thejeffparadox/docs/wiki/FAQ.md",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "line": 76,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/thejeffparadox/thejeffparadox/README.adoc",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "line": 77,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/thejeffparadox/thejeffparadox/README.adoc",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "reason": "Repository has 8 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 -- 9 day(s) old [STALE]",
    "type": "CSA001",
    "file": ".github/workflows/hypatia-scan.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD009 -- Hypatia structural_drift: SD009 -- 9 day(s) old",
    "type": "CSA001",
    "file": "ffi/zig/src/main.zig",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  }
]

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