feat: migrate browser automation from Playwright MCP to CLI, fix headless setting

Major changes across 21 files (755 additions, 196 deletions):

Browser Automation Migration:
- Add versioned project migration system (prompts.py) with content-based
  detection and section-level regex replacement for coding/testing prompts
- Migrate STEP 5 (browser verification) and BROWSER AUTOMATION sections
  in coding prompt template to use playwright-cli commands
- Migrate STEP 2 and AVAILABLE TOOLS sections in testing prompt template
- Migration auto-runs at agent startup (autonomous_agent_demo.py), copies
  playwright-cli skill, scaffolds .playwright/cli.config.json, updates
  .gitignore, and stamps .migration_version file
- Add playwright-cli command validation to security allowlist (security.py)
  with tests for allowed subcommands and blocked eval/run-code

Headless Browser Setting Fix:
- Add _apply_playwright_headless() to process_manager.py that reads/updates
  .playwright/cli.config.json before agent subprocess launch
- Remove dead PLAYWRIGHT_HEADLESS env var that was never consumed
- Settings UI toggle now correctly controls visible browser window

Playwright CLI Auto-Install:
- Add ensurePlaywrightCli() to lib/cli.js for npm global entry point
- Add playwright-cli detection + npm install to start.bat, start.sh,
  start_ui.bat, start_ui.sh for all startup paths

Other Improvements:
- Add project folder path tooltip to ProjectSelector.tsx dropdown items
- Remove legacy Playwright MCP server configuration from client.py
- Update CLAUDE.md with playwright-cli skill documentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client.py

@@ -21,16 +21,6 @@ from security import SENSITIVE_DIRECTORIES, bash_security_hook
 # Load environment variables from .env file if present
 load_dotenv()
 
-# Default Playwright headless mode - can be overridden via PLAYWRIGHT_HEADLESS env var
-# When True, browser runs invisibly in background (default - saves CPU)
-# When False, browser window is visible (useful for monitoring agent progress)
-DEFAULT_PLAYWRIGHT_HEADLESS = True
-
-# Default browser for Playwright - can be overridden via PLAYWRIGHT_BROWSER env var
-# Options: chrome, firefox, webkit, msedge
-# Firefox is recommended for lower CPU usage
-DEFAULT_PLAYWRIGHT_BROWSER = "firefox"
-
 # Extra read paths for cross-project file access (read-only)
 # Set EXTRA_READ_PATHS environment variable with comma-separated absolute paths
 # Example: EXTRA_READ_PATHS=/Volumes/Data/dev,/Users/shared/libs
@@ -41,6 +31,7 @@ EXTRA_READ_PATHS_VAR = "EXTRA_READ_PATHS"
 # this blocklist and the filesystem browser API share a single source of truth.
 EXTRA_READ_PATHS_BLOCKLIST = SENSITIVE_DIRECTORIES
 
+
 def convert_model_for_vertex(model: str) -> str:
     """
     Convert model name format for Vertex AI compatibility.
@@ -72,43 +63,6 @@ def convert_model_for_vertex(model: str) -> str:
     return model
 
 
-def get_playwright_headless() -> bool:
-    """
-    Get the Playwright headless mode setting.
-
-    Reads from PLAYWRIGHT_HEADLESS environment variable, defaults to True.
-    Returns True for headless mode (invisible browser), False for visible browser.
-    """
-    value = os.getenv("PLAYWRIGHT_HEADLESS", str(DEFAULT_PLAYWRIGHT_HEADLESS).lower()).strip().lower()
-    truthy = {"true", "1", "yes", "on"}
-    falsy = {"false", "0", "no", "off"}
-    if value not in truthy | falsy:
-        print(f"   - Warning: Invalid PLAYWRIGHT_HEADLESS='{value}', defaulting to {DEFAULT_PLAYWRIGHT_HEADLESS}")
-        return DEFAULT_PLAYWRIGHT_HEADLESS
-    return value in truthy
-
-
-# Valid browsers supported by Playwright MCP
-VALID_PLAYWRIGHT_BROWSERS = {"chrome", "firefox", "webkit", "msedge"}
-
-
-def get_playwright_browser() -> str:
-    """
-    Get the browser to use for Playwright.
-
-    Reads from PLAYWRIGHT_BROWSER environment variable, defaults to firefox.
-    Options: chrome, firefox, webkit, msedge
-    Firefox is recommended for lower CPU usage.
-    """
-    value = os.getenv("PLAYWRIGHT_BROWSER", DEFAULT_PLAYWRIGHT_BROWSER).strip().lower()
-    if value not in VALID_PLAYWRIGHT_BROWSERS:
-        print(f"   - Warning: Invalid PLAYWRIGHT_BROWSER='{value}', "
-              f"valid options: {', '.join(sorted(VALID_PLAYWRIGHT_BROWSERS))}. "
-              f"Defaulting to {DEFAULT_PLAYWRIGHT_BROWSER}")
-        return DEFAULT_PLAYWRIGHT_BROWSER
-    return value
-
-
 def get_extra_read_paths() -> list[Path]:
     """
     Get extra read-only paths from EXTRA_READ_PATHS environment variable.
@@ -228,41 +182,6 @@ ALL_FEATURE_MCP_TOOLS = sorted(
     set(CODING_AGENT_TOOLS) | set(TESTING_AGENT_TOOLS) | set(INITIALIZER_AGENT_TOOLS)
 )
 
-# Playwright MCP tools for browser automation.
-# Full set of tools for comprehensive UI testing including drag-and-drop,
-# hover menus, file uploads, tab management, etc.
-PLAYWRIGHT_TOOLS = [
-    # Core navigation & screenshots
-    "mcp__playwright__browser_navigate",
-    "mcp__playwright__browser_navigate_back",
-    "mcp__playwright__browser_take_screenshot",
-    "mcp__playwright__browser_snapshot",
-
-    # Element interaction
-    "mcp__playwright__browser_click",
-    "mcp__playwright__browser_type",
-    "mcp__playwright__browser_fill_form",
-    "mcp__playwright__browser_select_option",
-    "mcp__playwright__browser_press_key",
-    "mcp__playwright__browser_drag",
-    "mcp__playwright__browser_hover",
-    "mcp__playwright__browser_file_upload",
-
-    # JavaScript & debugging
-    "mcp__playwright__browser_evaluate",
-    # "mcp__playwright__browser_run_code",  # REMOVED - causes Playwright MCP server crash
-    "mcp__playwright__browser_console_messages",
-    "mcp__playwright__browser_network_requests",
-
-    # Browser management
-    "mcp__playwright__browser_resize",
-    "mcp__playwright__browser_wait_for",
-    "mcp__playwright__browser_handle_dialog",
-    "mcp__playwright__browser_install",
-    "mcp__playwright__browser_close",
-    "mcp__playwright__browser_tabs",
-]
-
 # Built-in tools available to agents.
 # WebFetch and WebSearch are included so coding agents can look up current
 # documentation for frameworks and libraries they are implementing.
@@ -282,7 +201,6 @@ def create_client(
     project_dir: Path,
     model: str,
     yolo_mode: bool = False,
-    agent_id: str | None = None,
     agent_type: str = "coding",
 ):
     """
@@ -291,9 +209,7 @@ def create_client(
     Args:
         project_dir: Directory for the project
         model: Claude model to use
-        yolo_mode: If True, skip Playwright MCP server for rapid prototyping
-        agent_id: Optional unique identifier for browser isolation in parallel mode.
-                  When provided, each agent gets its own browser profile.
+        yolo_mode: If True, skip browser testing for rapid prototyping
         agent_type: One of "coding", "testing", or "initializer". Controls which
                     MCP tools are exposed and the max_turns limit.
 
@@ -327,11 +243,8 @@ def create_client(
     }
     max_turns = max_turns_map.get(agent_type, 300)
 
-    # Build allowed tools list based on mode and agent type.
-    # In YOLO mode, exclude Playwright tools for faster prototyping.
+    # Build allowed tools list based on agent type.
     allowed_tools = [*BUILTIN_TOOLS, *feature_tools]
-    if not yolo_mode:
-        allowed_tools.extend(PLAYWRIGHT_TOOLS)
 
     # Build permissions list.
     # We permit ALL feature MCP tools at the security layer (so the MCP server
@@ -363,10 +276,6 @@ def create_client(
         permissions_list.append(f"Glob({path}/**)")
         permissions_list.append(f"Grep({path}/**)")
 
-    if not yolo_mode:
-        # Allow Playwright MCP tools for browser automation (standard mode only)
-        permissions_list.extend(PLAYWRIGHT_TOOLS)
-
     # Create comprehensive security settings
     # Note: Using relative paths ("./**") restricts access to project directory
     # since cwd is set to project_dir
@@ -395,9 +304,9 @@ def create_client(
         print(f"   - Extra read paths (validated): {', '.join(str(p) for p in extra_read_paths)}")
     print("   - Bash commands restricted to allowlist (see security.py)")
     if yolo_mode:
-        print("   - MCP servers: features (database) - YOLO MODE (no Playwright)")
+        print("   - MCP servers: features (database) - YOLO MODE (no browser testing)")
     else:
-        print("   - MCP servers: playwright (browser), features (database)")
+        print("   - MCP servers: features (database)")
     print("   - Project settings enabled (skills, commands, CLAUDE.md)")
     print()
 
@@ -421,36 +330,6 @@ def create_client(
             },
         },
     }
-    if not yolo_mode:
-        # Include Playwright MCP server for browser automation (standard mode only)
-        # Browser and headless mode configurable via environment variables
-        browser = get_playwright_browser()
-        playwright_args = [
-            "@playwright/mcp@latest",
-            "--viewport-size", "1280x720",
-            "--browser", browser,
-        ]
-        if get_playwright_headless():
-            playwright_args.append("--headless")
-        print(f"   - Browser: {browser} (headless={get_playwright_headless()})")
-
-        # Browser isolation for parallel execution
-        # Each agent gets its own isolated browser context to prevent tab conflicts
-        if agent_id:
-            # Use --isolated for ephemeral browser context
-            # This creates a fresh, isolated context without persistent state
-            # Note: --isolated and --user-data-dir are mutually exclusive
-            playwright_args.append("--isolated")
-            print(f"   - Browser isolation enabled for agent: {agent_id}")
-
-        mcp_servers["playwright"] = {
-            "command": "npx",
-            "args": playwright_args,
-            "env": {
-                "NODE_COMPILE_CACHE": "",  # Disable V8 compile caching to prevent .node file accumulation in %TEMP%
-            },
-        }
-
     # Build environment overrides for API endpoint configuration
     # Uses get_effective_sdk_env() which reads provider settings from the database,
     # ensuring UI-configured alternative providers (GLM, Ollama, Kimi, Custom) propagate