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/claude-code-hooks/handlers/session-event-handler-retry.test.ts

@@ -1,4 +1,4 @@
-const { beforeEach, describe, expect, mock, test } = require("bun:test")
+const { beforeEach, describe, expect, mock, test, afterAll } = require("bun:test")
 
 const executeStopHooks = mock(async (context: { parentSessionId?: string }) => ({
   block: false,
@@ -19,6 +19,8 @@ mock.module("../stop", () => ({
   executeStopHooks,
 }))
 
+afterAll(() => { mock.restore() })
+
 const { createSessionEventHandler } = await import("./session-event-handler")
 
 describe("createSessionEventHandler retry behavior", () => {