chore(ci): prune CI noise — single governance wrapper (verisimiser#59) (#45)

Estate rollout of the governance wrapper (parent:
hyperpolymath/verisimiser#59).

Replaces **8** duplicated per-repo governance workflows with **one**
wrapper (`governance.yml`) that calls the shared reusable bundle
`hyperpolymath/standards/.github/workflows/governance-reusable.yml`
(companion: hyperpolymath/standards#81).

Kept standalone: load-bearing build/security workflows (rust-ci, codeql,
dependabot, release, secret-scanner, scorecard) and any repo-specific
gates.

**Ordering:** merge hyperpolymath/standards#81 first; the `governance`
job resolves `@main` and goes green once the reusable workflow exists.
Non-blocking until then.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: hyperpolymath <hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/governance.yml

@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: PMPL-1.0
+# governance.yml — single wrapper calling the shared estate governance bundle
+# in hyperpolymath/standards. Replaces ~8 duplicated per-repo governance
+# workflows (verisimiser#59 estate rollout). Load-bearing build/security
+# workflows (rust-ci, codeql, dependabot, release, secret-scanner, scorecard)
+# stay standalone in this repo.
+name: Governance
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  governance:
+    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@main