Chat file handling:
- Fix file_search filtering by user_id only (not session_id) for cross-session access
- Add SHA-256 content hash deduplication in OpenAI vector store
- Reduce file_search max results to 3 to prevent context overflow
- Add file corpus discovery so AI knows which files are searchable
- Fix reasoning.effort parameter only sent to reasoning models
- Add hasattr guard for text attribute on image-only messages

Sandbox management:
- Add orphan cleanup loop (5min interval) to remove containers without active sessions
- Add /internal/sandboxes/{id}/has-active-session endpoint for session verification
- Add port_manager.scan_existing_containers() to recover state on restart
- Add LOCAL_MODE config with orphan cleanup settings

Resource limits:
- Add MAX_TABS=20 limit in browser with force-close of oldest tabs
- Add MAX_SHELL_SESSIONS=10 limit in shell tool

Tests: Add 248 unit tests covering all changes

## New Features
- expose_port(external) parameter: external=True returns localhost:port for browser access,
  external=False returns internal Docker IP for container-to-container communication
- LLMConfig.get_max_output_tokens(): Model-specific output token limits
  (64K Claude 4, 100K o1, 16K GPT-4, 8K Gemini)
- Browser MAX_TABS=20 limit with automatic cleanup of oldest tabs
- Shell session MAX_SHELL_SESSIONS=15 limit with clear error messages
- Anthropic native thinking blocks support via beta endpoint
- Extended context (1M tokens) support for Claude models

## Frontend Improvements
- Added selectIsStopped selector for proper stopped state UI handling
- Fixed agent task state transitions for cancelled sessions
- Improved subagent container with session awareness

## New Test Coverage (343 tests total)
- tests/llm/test_llm_config.py: LLMConfig.get_max_output_tokens() tests
- tests/tools/test_browser_tab_limit.py: Browser MAX_TABS enforcement
- tests/tools/test_resource_limits.py: Browser and shell session limits
- tests/tools/test_generation_config_factory.py: Image/video generation configs
- tests/tools/test_openai_dalle.py: DALL-E 3 image generation client
- tests/tools/test_openai_sora.py: Sora video generation client
- tests/storage/test_local_storage.py: LocalStorage.get_permanent_url()
- tests/storage/test_tool_local_storage.py: Tool server LocalStorage

## Code Quality
- Removed debug print statements from anthropic.py
- Removed trailing whitespace from all files
- Fixed test assertions to match implementation behavior

…proposed changes.

…tension architecture docs

- Refactor run_stack.sh to support both cloud (E2B/ngrok) and local-only (Docker sandbox) modes
- Add start, stop, restart, status, logs, build, and setup commands
- Implement auto-detection of local mode based on env file presence
- Auto-create env files from templates with helpful setup instructions
- Add --local flag for explicit local mode selection
- Fix color output using $'...' syntax and printf for portability
- Add VS Code extension architecture documentation with detailed design specs
- Add executive summary document for VS Code extension integration

Converts HTML files (slides, pages, etc.) to a single multi-page PDF
using Playwright/Chromium. Each HTML file becomes exactly one page
with full content capture (no truncation).

Features:
- Automatic content height detection
- Configurable viewport width and DPI
- Supports directory input or specific files
- Progress output with quiet mode option

…s, pages, etc.) to a single multi-page PDF\nusing Playwright/Chromium. Each HTML file becomes exactly one page\nwith full content capture (no truncation).\n\nFeatures:\n- Automatic content height detection\n- Configurable viewport width and DPI\n- Supports directory input or specific files\n- Progress output with quiet mode option

…rvice controls to run_stack.sh

- Fix LocalStorage.get_upload_signed_url() to use internal_url_base (default)
  for server-to-server uploads, preventing hang when backend tries to upload
  via localhost URL inside Docker container
- Add individual service start/stop/restart controls to run_stack.sh
  (e.g., ./scripts/run_stack.sh restart frontend --local)

…control wake

Slides content processor:
- Fix deadlock when LocalStorage upload URL points to backend itself
- Use direct write for LocalStorage (avoid self-request)
- Use async httpx with timeout for external storage (GCS/S3)

Subagent interrupt handling:
- Add SUB_AGENT_INTERRUPTED event type for proper UI state
- Add emit_completion_event() helper to BaseAgentTool
- Update all subagent tools to emit correct completion/interrupted events
- Handle asyncio.CancelledError in CodexAgent

Stack control:
- Replace run_stack.sh with unified stack_control.sh
- Add 'wake' command to restart stopped sandbox containers after reboot
- Add 'recover' command to fix stuck sessions and restart backend
- Auto-detect local vs cloud mode from running containers