fix: add tsx dependency and fix workflow step ordering

- Add tsx as an e2e devDependency (was missing, causing silent failures)
- Replace `npx tsx` with `pnpm exec tsx` throughout
- Move `pnpm install` before `playwright install` (correct ordering)
- Remove `2>/dev/null` that was hiding analyzer errors
- Add debug logging to route analysis step
- Set default working-directory for the job

https://claude.ai/code/session_01XSTqDJXuR4jaLN7SGm3uES

pnpm-lock.yaml

@@ -276,6 +276,9 @@ importers:
       supertest:
         specifier: ^7.0.0
         version: 7.2.2
+      tsx:
+        specifier: ^4.21.0
+        version: 4.21.0
       typescript:
         specifier: ^5.3.3
         version: 5.9.3