ci(adapter-test): gate adapter-test off pull_request trigger (#1522)

Per @WAWQAQ direction (DM): trim PR-time CI to fast-feedback only.
adapter-test (~30-60s) is the next-largest PR wait after e2e-headed
(which #1521 just removed). Adapter authors typically run focused tests
locally before pushing (`npm run test:adapter`); CI duplication adds
queue latency without catching new classes of bugs.

PR-time CI surface now:
  - typecheck / unit (~1 min)
  - lint gates (typed-error / silent-column-drop)
  - build × 3 platforms

Adapter test guards (still strict):
  - push to main / dev
  - nightly cron
  - workflow_dispatch (manual when an adapter-heavy PR really wants the
    signal before merge)

Same gate as smoke-test (`if: github.event_name == 'push' || schedule
|| workflow_dispatch`) for consistency.

Author: jackwener

.github/workflows/ci.yml

@@ -110,8 +110,12 @@ jobs:
       - name: Run unit tests under Bun
         run: bun vitest run --project unit --reporter=verbose
 
-  # Adapter tests are pure unit tests — OS doesn't affect results.
+  # Adapter tests are pure unit tests — OS doesn't affect results. Gated off
+  # `pull_request` to keep PR CI under ~2 minutes; adapter authors run focused
+  # tests locally before pushing, and `push` to main / nightly cron / manual
+  # dispatch still guard the merged state.
   adapter-test:
+    if: github.event_name == 'push' || github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-latest
     needs: build
     steps: