ci: refresh stale standards reusable-workflow pins (5a93d9d → e8fe153) (#36)

## What

Refreshes the three `standards` reusable-workflow pins from the
out-of-window `5a93d9d57cc0…` to current standards HEAD `e8fe153b568a…`:

- `.github/workflows/governance.yml` →
`governance-reusable.yml@e8fe153…`
- `.github/workflows/hypatia-scan.yml` →
`hypatia-scan-reusable.yml@e8fe153…`
- `.github/workflows/scorecard.yml` → `scorecard-reusable.yml@e8fe153…`

## Why — one stale pin caused two red checks

- **`governance / Check Workflow Staleness`**: per
`standards/scripts/check-workflow-staleness.sh`, a pin must be a
recognised ancestor of standards HEAD within the recency window (≤50
commits or ≤14 days). `5a93d9d…` classified `UNKNOWN` → fail. `e8fe153…`
is current HEAD → `FRESH` → pass.
- **`scan / Hypatia Neurosymbolic Analysis`**: the `5a93d9d…` revision
of `hypatia-scan-reusable.yml` referenced a **non-existent**
`actions/cache@d4373f26…` (action-resolution error). Standards HEAD
`e8fe153…` uses the valid `actions/cache@27d5ce7…` (the same SHA
casket's own `ci.yml`/`pages.yml`/`release.yml` already pin), so the
bump fixes resolution.

Verified against a local `standards` checkout at `e8fe153…`: all three
reusables exist there and `hypatia-scan-reusable.yml` pins
`actions/cache@27d5ce7…`.

## Scope notes

- No `scorecard-enforcer.yml` exists in this repo — the staleness
summary line about it is the script's catch-all message, not a
present-file finding.
- The `mirror`/`secret-scanner` reusables are not in the staleness trio
and are not at the stale pin; left untouched.
- Independent of #35 (the `6a2/ → descriptiles/` rename); this PR is
branched from `main` to keep that one a clean rename.
- The separate **Build + Gnosis** failure (a Pandoc `HighlightMethod`
API mismatch in `CasketGnosis.hs`) is **not** addressed here — it's
being folded into the Pandoc-engine decision/ADR.

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

https://claude.ai/code/session_01WN6nPWWe4dvXfoqBG6auWN

---
_Generated by [Claude
Code](https://claude.ai/code/session_01WN6nPWWe4dvXfoqBG6auWN)_

Co-authored-by: Claude <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/governance.yml

@@ -13,4 +13,4 @@ permissions:
 
 jobs:
   governance:
-    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@5a93d9d57cc04de4002d6d0ecd336fc7a8698910
+    uses: hyperpolymath/standards/.github/workflows/governance-reusable.yml@e8fe153b568af5e3534a261eee0258fa84fa6c5e

.github/workflows/hypatia-scan.yml

@@ -16,4 +16,4 @@ permissions:
 
 jobs:
   scan:
-    uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@5a93d9d57cc04de4002d6d0ecd336fc7a8698910
+    uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@e8fe153b568af5e3534a261eee0258fa84fa6c5e

.github/workflows/scorecard.yml

@@ -13,4 +13,4 @@ permissions:
 
 jobs:
   scorecard:
-    uses: hyperpolymath/standards/.github/workflows/scorecard-reusable.yml@5a93d9d57cc04de4002d6d0ecd336fc7a8698910
+    uses: hyperpolymath/standards/.github/workflows/scorecard-reusable.yml@e8fe153b568af5e3534a261eee0258fa84fa6c5e