fix(ci): simplify test runner to plain bun test by fixing mock.module() leakage

- Add afterAll(() => { mock.restore() }) to 52 test files missing cleanup
- Rewrite create-tool-guard-hooks.test.ts to use spyOn instead of barrel mock
- Fix skill-mcp-manager OAuth tests with missing mockTokens/mockLogin definitions
- Fix start-work hook: show worktree active block on resume with existing worktree_path
- Extract createWorktreeActiveBlock to worktree-block.ts to avoid circular import
- Replace 80-line isolated test runner CI config with single `bun test` command

src/hooks/preemptive-compaction.context-limit-cache.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, it, mock } from "bun:test"
+import { describe, expect, it, mock, afterAll } from "bun:test"
 
 import { applyProviderConfig } from "../plugin-handlers/provider-config-handler"
 import { createModelCacheState } from "../plugin-state"
@@ -9,6 +9,8 @@ mock.module("../shared/logger", () => ({
   log: logMock,
 }))
 
+afterAll(() => { mock.restore() })
+
 const { createPreemptiveCompactionHook } = await import("./preemptive-compaction")
 
 function createMockCtx() {