ci: run check, lint:arch, lint:dead, and tests

CI previously ran only typecheck/lint/format and skipped both the
electron compile (`npm run compile` is the closest thing to a build
gate for main-process code) and the test suite. After the cycle fix
and knip cleanup, the static gates are green, so wire them in:

- `npm run check` — covers compile + typecheck + lint + format:check.
- `npm run lint:arch` — depcruise enforcement, now green.
- `npm run lint:dead` — knip, now green.
- `npm test` — vitest run across renderer and main suites.

Addresses finding 3 of issue #157.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: 2 people

.github/workflows/ci.yml

@@ -19,11 +19,14 @@ jobs:
 
       - run: npm ci
 
-      - name: Typecheck
-        run: npm run typecheck
+      - name: Check (compile + typecheck + lint + format)
+        run: npm run check
 
-      - name: Lint
-        run: npm run lint
+      - name: Lint (architecture)
+        run: npm run lint:arch
 
-      - name: Format check
-        run: npm run format:check
+      - name: Lint (dead code)
+        run: npm run lint:dead
+
+      - name: Test
+        run: npm test