feat: replace k8s log API streaming with filesystem tailing

Replaces K8s log API streaming (which was dropping every ~3 seconds at
production scale) with filesystem tailing via tee to a pod log file on
the shared PVC.

Core changes:
- Add tee to claudeInvocation to write pod log file
- Add mkdir -p to init container to create log directory
- Add assertSafePathComponent and buildPodLogPath helper
- Add tailPodLogFile function with adaptive 250ms/1s polling
- Replace k8s log streaming with tailPodLogFile in Promise.allSettled
- Delete log-dedup.ts (RTK output truncation no longer needed)
- Update config-schema.ts and index.ts to remove RTK references
- Clean up log file in cleanupJob when retainJobs=false

Note: 14 tests in execute.test.ts test the obsolete k8s log streaming
approach and need to be rewritten or deleted (streamPodLogsOnce tests).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "paperclip-adapter-claude-k8s",
-  "version": "0.1.54",
+  "version": "0.2.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "paperclip-adapter-claude-k8s",
-      "version": "0.1.54",
+      "version": "0.2.0",
       "license": "MIT",
       "dependencies": {
         "@kubernetes/client-node": "^1.0.0",