test: mock readPaperclipRuntimeSkillEntries to eliminate real fs I/O under fake timers

Previously the test suite relied on real fs.stat completing within the fake
timer advance window (~11200ms).  Under CI with 11 parallel test files the I/O
could drain later than the advances allowed, causing a 1-in-4 timeout on the
"logs pod pending" test.

Fix: mock @paperclipai/adapter-utils/server-utils using vi.hoisted() + Object.assign
so readPaperclipRuntimeSkillEntries resolves immediately as a microtask.  All other
exports are forwarded to the real module via importOriginal.  Each beforeEach that
calls vi.resetAllMocks() or vi.clearAllMocks() now also calls
mockReadSkillEntries.mockResolvedValue([]) to restore the implementation.

Timer advances in affected tests are simplified to reflect the purely fake-timer
sequence (no I/O drain prefix).  All 323 tests pass deterministically.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "paperclip-adapter-claude-k8s",
-  "version": "0.1.35",
+  "version": "0.1.36",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "paperclip-adapter-claude-k8s",
-      "version": "0.1.35",
+      "version": "0.1.36",
       "license": "MIT",
       "dependencies": {
         "@kubernetes/client-node": "^1.0.0",