feat: declare hasOutOfProcessLiveness and remove onSpawn workarounds (FAR-24)

- Add `hasOutOfProcessLiveness: true` to createServerAdapter() so the
  reaper skips local PID checks and uses the staleness window instead.
- Remove the initial onSpawn call and all periodic keepalive onSpawn
  refreshes that were compensating for the missing flag.
- Remove POST_TERMINAL_KEEPALIVE_MS constant and keepaliveTick counter
  that backed those workarounds.
- Cast required: adapter-utils ServerAdapterModule type predates this field.
- Bump to 0.1.38.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "paperclip-adapter-claude-k8s",
-  "version": "0.1.37",
+  "version": "0.1.38",
   "description": "Paperclip adapter plugin that runs Claude Code agents as Kubernetes Jobs",
   "license": "MIT",
   "repository": {