ci: run all jobs in parallel to reduce pipeline time

Remove `needs` dependencies from e2e-tests and docker-build jobs.
They don't depend on lint/unit outputs — failures are visible from
their own jobs. Saves ~22s off the critical path.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -51,7 +51,6 @@ jobs:
   e2e-tests:
     name: E2E Tests
     runs-on: ubuntu-latest
-    needs: [lint-and-check, unit-tests]
     steps:
       - uses: actions/checkout@v4
 
@@ -95,7 +94,6 @@ jobs:
   docker-build:
     name: Docker Build
     runs-on: ubuntu-latest
-    needs: [lint-and-check, unit-tests]
     steps:
       - uses: actions/checkout@v4