feat(debug): add persistent website diagnostics and network controls

[iuyo5678]

Summary

Developers investigating their own websites need a retained evidence trail that an agent can inspect without stitching together unrelated console, network, and page snapshots. This adds an opt-in debugging workflow across the CLI, DSH tools, and extension, while preserving the existing popup controls.

• Capture requests and bounded text bodies, console events, page context, and manual or agent operations. Group evidence around each operation, expose field changes, and identify missing or partial capture explicitly.
• Save browser-local history with detail views and JSON export. Add bounded query output, filters, capability discovery, request pinning, and explicit busy-state/wait commands.
• Record native main-frame performance evidence with validity reasons and visibility history. Add endpoint aggregation, slow-request summaries, and suspected duplicate-request statistics with source request IDs.
• Add task-scoped request blocking, modification, mock responses, and same-origin replay. Retain intervention provenance and clean up controls when capture or ownership ends.
• Harden capture deadlines and cancellation, retain in-flight requests beyond the recent-request cache, preserve legacy history details, and allow the original task to read saved captures after they leave the four-run live cache.

Scope and limits

Capture starts only when requested and is not retroactive. Persistent evidence and response bodies remain bounded; redaction, truncation, interruption, and storage gaps are reported. Task and tab ownership restrict access. Performance support is main-frame only and excludes INP and CPU profiling. Temporal associations and suspected duplicates are investigation aids, not causal conclusions. Source-code repair and automatic repair verification are outside this feature.

The extension adds current-task access and a dedicated debugging/history workspace. Existing popup functions remain available. Documentation, schemas, agent instructions, and translations are included.

Validation

• Extension suite: 1,843 passed; 102 environment-dependent tests skipped.
• Isolated Chrome debugging suite: 96 passed, including real network controls, performance capture, IndexedDB recovery/upgrade, frozen-renderer deadlines, and late-hook recovery.
• DSH suite: 245 passed. Rust workspace: 715 passed on the latest CLI/protocol changes; the final hardening commit changes extension code only.
• TypeScript, lint, Rust formatting/Clippy, production builds, and extension package consistency checks passed.
• Regression coverage includes slow requests surviving cache pressure, pending body reads, explicit tracking overflow, legacy body/header/timing detail reads, more than four captures in one task, reused task IDs, and revoked tab access.

Related: #222 and #61.