🧪 test: add @wip tag for focused development

- Add @wip tag documentation to BDD_TAGS.md
- Modify all feature test suites to include @wip in tag filters
- Update test scripts to handle @wip tag inclusion
- @wip overrides exclusion tags (@todo, @skip, @flaky) for active development

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

scripts/test-all-features-parallel.sh

@@ -43,9 +43,9 @@ run_feature_test() {
         docker exec dance-lessons-coach-postgres createdb -U postgres "${DLC_DATABASE_NAME}"
     fi
     
-    # Run the feature tests with tag exclusion
+    # Run the feature tests with tag exclusion and WIP inclusion
     cd "features/${feature_name}"
-    FEATURE=${feature_name} DLC_DATABASE_NAME="${DLC_DATABASE_NAME}" go test -v . -tags="~@flaky && ~@todo && ~@skip" 2>&1 | grep -E "(PASS|FAIL|RUN)" || true
+    FEATURE=${feature_name} DLC_DATABASE_NAME="${DLC_DATABASE_NAME}" go test -v . -tags="~@flaky && ~@todo && ~@skip && @wip" 2>&1 | grep -E "(PASS|FAIL|RUN)" || true
     
     # Cleanup
     cd ../..