chore(ci): bump standards governance-reusable pin past #219 fix (#116)

## Root cause

`.github/workflows/governance.yml:34` pins
`governance-reusable.yml@128a854` (2026-05-20) — predates
[standards#219](hyperpolymath/standards#219)
(`ad366b6`, 2026-05-27) which fixes `workflow_sha` resolution. Without
this fix, `governance / Language / package anti-pattern policy` fails
with exit 128 on the inner self-checkout.

## Pin changed

| File | Before | After |
|---|---|---|
| `.github/workflows/governance.yml:34` | `128a854` (pre-#219) |
`5eb28d7` (standards/main, post-#219) |

## Auto-merge

SQUASH.

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

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/governance.yml

@@ -31,4 +31,4 @@ permissions:
 
 jobs:
   governance:
-    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@128a854b199848c1603c5748260ca33f0ce559c6 # main 2026-05-20
+    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@5eb28d7d8790d5389b7b6a5233fe6265a775e3d0 # main 2026-05-27 (post-#219 workflow_sha fix)