ci(cleanup): trim lint+test scope for faster pipelines

- ci.yaml: ./gradlew lint -> lintDebug, test -> testDebugUnitTest.
  Default lint task runs for BOTH debug and release variants which
  doubles the scan work; AGP's lint catalog is identical between
  variants for our scope so debug-only is sufficient. Same for test:
  testDebugUnitTest avoids running release-variant test compilation.

- release.yaml: drop lint step from ci-sanity job. Lint is enforced
  on every push to main via ci.yaml; by the time a tag exists at a
  main commit, lint has already passed. Release-sanity keeps test +
  assembleDebug to catch any tag-resolved drift (e.g. version code
  substitution issues).

Expected CI run time reduction: ~30% (lint accounts for the largest
single block of cold-cache work).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/release.yaml

@@ -37,11 +37,12 @@ jobs:
       - name: Grant execute permission for gradlew
         run: chmod +x ./gradlew
 
-      - name: Lint
-        run: ./gradlew lint --no-daemon
+      # Lint already enforced on every push to main via ci.yaml.
+      # Release sanity only re-runs tests + a debug build to catch
+      # any tag-resolved drift (e.g. version code substitution issues).
 
       - name: Unit tests
-        run: ./gradlew test --no-daemon
+        run: ./gradlew testDebugUnitTest --no-daemon
 
       - name: Assemble debug APK (sanity)
         run: ./gradlew assembleDebug --no-daemon