Improve CI pipeline consistency and efficiency

- Rename integration_test_prod to smoke_test_prod for clarity
- Share pip cache between unit and integration tests
- Add interruptible: true to test jobs (cancel on new pipeline)
- Add retry: 1 to integration tests (handle network flakiness)
- Simplify verify_deployment to health check only (integration tests do full checks)
- Make cleanup_feature standalone (doesn't need deploy dependencies)
- Extract environment URLs (STAGE_URL, PROD_URL) to global variables
- Add timeout: 5m to cleanup_feature
- Remove -x flag from integration tests (show all failures)

CHANGELOG.md

@@ -63,6 +63,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - CI integration tests now run full pytest suite (~350 tests) against deployed environment instead of 3 smoke tests
 - CI production deployment uses lightweight smoke tests only (no test data creation in prod)
+- CI pipeline improvements: shared pip cache, `interruptible` flag on test jobs, retry on integration tests
+- Simplified deploy verification to health check only (full checks done by integration tests)
+- Extracted environment URLs to global variables for maintainability
+- Made `cleanup_feature` job standalone (no longer inherits deploy template dependencies)
+- Renamed `integration_test_prod` to `smoke_test_prod` for clarity
 - Updated download ref resolution to check versions before tags (version → tag → artifact ID) (#56)
 - Deploy jobs now require all security scans to pass before deployment (added test_image, app_deps_scan, cve_scan, cve_sbom_analysis, app_sbom_analysis to dependencies) (#63)
 - Increased deploy job timeout from 5m to 10m (#63)