chore(ci): bump governance-reusable pin to standards main

The pinned revision carries bugs that make Governance red on every
consumer: the Workflow security linter runs update-actions-lock.sh from
the CALLER's checkout where it does not exist (exit 127), and Allowlist
Preflight runs check-actions-policy.sh with an empty GH_TOKEN (exit 3).

Both are fixed on standards main. Witnessed green on hyperpolymath/blocky-writer
at this exact SHA: governance run completed/success, 15/15 jobs.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/governance.yml

@@ -15,4 +15,4 @@ permissions:
 
 jobs:
   governance:
-    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@84355587cb2a1f86e6882de83514a32db2646e7a
+    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@fad242d35291de1898242d6737ba02b74a59a2f2