fix(ci): small-lane batch — timeouts, right-sizing, windows cache warm-start

- timeout-minutes on the 6 remaining unbounded jobs (actionlint 5,
  skill-docs 10, version-gate 10, make-pdf-gate 15, pr-title-sync 5,
  evals build-image 15) — a hung step sat on GitHub's 360-min default
- right-size measured-over-long timeouts: dependency-review 10→5,
  windows-setup-e2e 15→10
- dependency-review: 2-core runner (28s API call on an 8-core box) and
  drop .github/workflows/** from its trigger paths (workflow edits have
  no dependencies to review)
- windows caches gain restore-keys: a lockfile bump paid the 26s/43s
  restore for a guaranteed cold miss

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/windows-setup-e2e.yml

@@ -38,7 +38,7 @@ permissions:
 jobs:
   windows-setup:
     runs-on: windows-latest
-    timeout-minutes: 15
+    timeout-minutes: 10
 
     steps:
       - uses: actions/checkout@v7
@@ -53,6 +53,10 @@ jobs:
         with:
           path: ~/.bun/install/cache
           key: windows-bun-${{ hashFiles('bun.lock') }}
+          # A lockfile bump starts from the previous cache instead of cold
+          # (restore alone costs ~43s; without this a bump pays it for nothing).
+          restore-keys: |
+            windows-bun-
 
       - name: Configure git identity
         run: |