fix(agent-browser): bound crashed preview cleanup

.project-docs/30-worklog/tasks/20260827-x01-crash-cleanup-7d4b1e92.md

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+# Task: Remediate X-01 crashed CDP cleanup
+
+## Identity
+
+- Task ID: 20260827-x01-crash-cleanup-7d4b1e92
+- Mode: Feature
+- Branch: codex/20260827-x01-crash-cleanup-7d4b1e92-x01-crash-cleanup-7d4b1e92
+- Worktree: D:\Datas\OthersProjects\makelore-x01-crash-cleanup-7d4b1e92
+- Base commit: 23c49aa3d28730be657387cf9c061fb3a3bb53a8
+- Owner: codex
+- Status: Ready for Integration
+
+## Scope
+
+- Bound best-effort preview-data cleanup CDP commands in
+  `electron/agent-browser/module.ts`, preserving normal removal, child release,
+  and auto-attach ordering.
+- Add the focused crashed-renderer/never-settling-removal regression in
+  `tests/unit/agent-browser-core.test.ts`.
+- Own only this task record and the two files above; do not modify the
+  coordinator, open a PR, or perform live acceptance.
+
+## Intent And Constraints
+
+- X-01 packaged evidence showed a crashed renderer can leave
+  `Page.removeScriptToEvaluateOnNewDocument` pending forever, blocking the next
+  public data-enabled `open` during cleanup.
+- Race each cleanup command against the existing bounded best-effort cleanup
+  convention (1,000 ms), swallow command failure/timeout, and clear timers.
+- Preserve successful cleanup ordering and the existing preview token
+  invalidation semantics; avoid a broad CDP refactor.
+
+## Planning Gate
+
+- Result: Passed.
+- Evidence: concurrent task gate started this isolated feature task from exact
+  base `23c49aa3d28730be657387cf9c061fb3a3bb53a8`; current task record,
+  project-memory entry documents, coordinator scope, lifecycle/X-01 pointers,
+  and relevant Agent Browser seams were read; no conflicting owned path was
+  found.
+
+## Plan
+
+1. Add a narrow bounded debugger-cleanup helper and apply it to preview script
+   removal, child waiting-target release, and cleanup auto-attach restoration.
+2. Prove a never-settling removal response cannot block crash invalidation and
+   the next data-enabled open.
+3. Run focused tests, typecheck, scoped lint, project-docs gates, and commit
+   once from the exact base.
+
+## Outcome
+
+- Added a 1,000 ms timer-bounded best-effort debugger command helper and used it
+  for preview script removal, document-child waiting-target release, and
+  cleanup `Target.setAutoAttach`. Normal successful cleanup retains its prior
+  ordering. A never-settling script-removal regression now proves renderer crash
+  invalidation does not block the next data-enabled open.
+
+## Verification
+
+- PASS: `corepack pnpm vitest run tests/unit/agent-browser-core.test.ts` (78/78).
+- PASS: `corepack pnpm run typecheck`.
+- PASS: `corepack pnpm exec eslint electron/agent-browser/module.ts tests/unit/agent-browser-core.test.ts`.
+- PASS: `git diff --check`.
+- PASS: `check_doc_drift.py --task-id 20260827-x01-crash-cleanup-7d4b1e92`.
+- The isolated worktree required `corepack pnpm install --frozen-lockfile
+  --offline`; it changed no tracked dependency files.
+
+## Follow-ups
+
+- No live/E2E run was requested for this bounded X-01 remediation; coordinator
+  should rerun live acceptance after integrating the commit.
+
+## Promotion Candidates
+
+- None; this is a feature-task implementation with no canonical project-memory
+  change.