test(e2e): add minimal startup E2E tests

Add E2E tests for LangBot startup flow:
- tests/e2e/utils/config_factory.py: minimal config generation
- tests/e2e/utils/process_manager.py: LangBot subprocess management
- tests/e2e/conftest.py: E2E fixtures (session-scoped process)
- tests/e2e/test_startup.py: 12 tests for startup verification

Tests verify:
- boot.py + stages execution
- database initialization (SQLite)
- API availability
- migrations applied

Uses embedded databases (SQLite, Chroma) - no external dependencies.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/e2e/utils/process_manager.py

@@ -0,0 +1,205 @@
+"""E2E test process manager.
+
+Manages LangBot subprocess lifecycle for E2E testing.
+"""
+
+from __future__ import annotations
+
+import subprocess
+import time
+import signal
+import os
+import shutil
+from pathlib import Path
+from typing import Optional
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class LangBotProcess:
+    """Manages a LangBot subprocess for E2E testing."""
+
+    def __init__(
+        self,
+        project_root: Path,
+        work_dir: Path,
+        port: int = 15300,
+        timeout: int = 30,
+        collect_coverage: bool = True,
+    ):
+        self.project_root = project_root
+        self.work_dir = work_dir  # Directory containing data/config.yaml
+        self.port = port
+        self.timeout = timeout
+        self.collect_coverage = collect_coverage
+        self.process: Optional[subprocess.Popen] = None
+        self._stdout_data: bytes = b''
+        self._stderr_data: bytes = b''
+        self._coverage_file: Optional[Path] = None
+
+    def start(self) -> bool:
+        """Start LangBot process and wait for it to be ready."""
+        import httpx
+
+        # Prepare environment
+        env = os.environ.copy()
+        env['PYTHONPATH'] = str(self.project_root / 'src')
+
+        # Set API port via environment variable
+        env['API__PORT'] = str(self.port)
+        env['API__WEBHOOK_PREFIX'] = f'http://127.0.0.1:{self.port}'
+
+        # Disable telemetry
+        env['SPACE__DISABLE_TELEMETRY'] = 'true'
+        env['SPACE__DISABLE_MODELS_SERVICE'] = 'true'
+
+        # Build command
+        if self.collect_coverage:
+            # Use coverage.py to collect coverage data
+            # Set COVERAGE_PROCESS_START to enable coverage in subprocess
+            self._coverage_file = self.work_dir / '.coverage.e2e'
+            env['COVERAGE_PROCESS_START'] = str(self.project_root / '.coveragerc')
+            env['COVERAGE_FILE'] = str(self._coverage_file)
+
+            # Create .coveragerc for subprocess
+            coveragerc_content = """
+[run]
+source = langbot.pkg
+parallel = True
+data_file = {}
+omit =
+    */tests/*
+    */test_*.py
+
+[report]
+precision = 2
+""".format(str(self._coverage_file))
+            coveragerc_path = self.work_dir / '.coveragerc'
+            with open(coveragerc_path, 'w') as f:
+                f.write(coveragerc_content)
+
+            cmd = [
+                'coverage', 'run',
+                '--rcfile=' + str(coveragerc_path),
+                '-m', 'langbot',
+            ]
+        else:
+            cmd = ['uv', 'run', 'python', '-m', 'langbot']
+
+        logger.info(f'Starting LangBot in: {self.work_dir}')
+        logger.info(f'Command: {cmd}')
+
+        # Start process (run in work_dir so it finds data/config.yaml)
+        self.process = subprocess.Popen(
+            cmd,
+            cwd=self.work_dir,
+            env=env,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            preexec_fn=os.setsid if os.name != 'nt' else None,
+        )
+
+        # Wait for startup
+        start_time = time.time()
+        while time.time() - start_time < self.timeout:
+            # Check if process died
+            if self.process.poll() is not None:
+                self._stdout_data, self._stderr_data = self.process.communicate()
+                logger.error(f'LangBot process died: {self._stderr_data.decode()}')
+                return False
+
+            # Try to connect
+            try:
+                r = httpx.get(
+                    f'http://127.0.0.1:{self.port}/api/v1/system/info',
+                    timeout=2.0,
+                )
+                if r.status_code == 200:
+                    logger.info(f'LangBot started successfully on port {self.port}')
+                    return True
+            except (httpx.ConnectError, httpx.TimeoutException):
+                pass
+
+            time.sleep(1)
+
+        # Timeout
+        logger.error(f'LangBot startup timeout after {self.timeout}s')
+        self.stop()
+        return False
+
+    def stop(self) -> None:
+        """Stop LangBot process gracefully."""
+        if self.process is None:
+            return
+
+        logger.info('Stopping LangBot process...')
+
+        # Try graceful shutdown first
+        if os.name != 'nt':
+            # Send SIGTERM to process group
+            os.killpg(os.getpgid(self.process.pid), signal.SIGTERM)
+        else:
+            self.process.terminate()
+
+        # Wait for graceful shutdown
+        try:
+            self.process.wait(timeout=5)
+            logger.info('LangBot stopped gracefully')
+        except subprocess.TimeoutExpired:
+            # Force kill
+            logger.warning('Force killing LangBot process')
+            if os.name != 'nt':
+                os.killpg(os.getpgid(self.process.pid), signal.SIGKILL)
+            else:
+                self.process.kill()
+            self.process.wait()
+
+        # Collect output for debugging
+        if self.process.stdout or self.process.stderr:
+            self._stdout_data, self._stderr_data = self.process.communicate()
+
+        self.process = None
+
+    def is_running(self) -> bool:
+        """Check if process is still running."""
+        return self.process is not None and self.process.poll() is None
+
+    def get_logs(self) -> tuple[str, str]:
+        """Get stdout and stderr logs."""
+        stdout = self._stdout_data.decode('utf-8', errors='replace')
+        stderr = self._stderr_data.decode('utf-8', errors='replace')
+        return stdout, stderr
+
+    def get_coverage_file(self) -> Optional[Path]:
+        """Get coverage data file path."""
+        return self._coverage_file
+
+    def health_check(self) -> bool:
+        """Check if LangBot API is responding."""
+        import httpx
+
+        if not self.is_running():
+            return False
+
+        try:
+            r = httpx.get(
+                f'http://127.0.0.1:{self.port}/api/v1/system/info',
+                timeout=5.0,
+            )
+            return r.status_code == 200
+        except Exception:
+            return False
+
+
+def find_project_root() -> Path:
+    """Find LangBot project root directory."""
+    current = Path(__file__).resolve()
+
+    # Walk up until we find src/langbot
+    for parent in current.parents:
+        if (parent / 'src' / 'langbot').exists():
+            return parent
+
+    # Fallback to LangBot-test-build directory
+    return Path('/home/glwuy/langbot-app/LangBot-test-build')