Add deployment safeguards to prevent code mismatch issues

- Add /api/version endpoint with git commit and file checksums
- Create automated deploy.ps1 script with pre-flight checks
- Document file dependencies to prevent partial deployments
- Add version verification before and after deployment

Prevents: 4-hour debugging sessions due to production/local mismatch
Ensures: All dependent files deploy together atomically
Verifies: Production matches local code after deployment

api/routers/version.py

@@ -0,0 +1,91 @@
+"""
+Version endpoint for ClaudeTools API.
+Returns version information to detect code mismatches.
+"""
+
+from fastapi import APIRouter
+from datetime import datetime
+import subprocess
+import os
+
+router = APIRouter()
+
+
+@router.get(
+    "/version",
+    response_model=dict,
+    summary="Get API version information",
+    description="Returns version, git commit, and deployment timestamp",
+)
+def get_version():
+    """
+    Get API version information.
+
+    Returns:
+        dict: Version info including git commit, branch, deployment time
+    """
+    version_info = {
+        "api_version": "1.0.0",
+        "component": "claudetools-api",
+        "deployment_timestamp": datetime.utcnow().isoformat() + "Z"
+    }
+
+    # Try to get git information
+    try:
+        # Get current commit hash
+        result = subprocess.run(
+            ["git", "rev-parse", "HEAD"],
+            capture_output=True,
+            text=True,
+            timeout=5,
+            cwd=os.path.dirname(os.path.dirname(__file__))
+        )
+        if result.returncode == 0:
+            version_info["git_commit"] = result.stdout.strip()
+            version_info["git_commit_short"] = result.stdout.strip()[:7]
+
+        # Get current branch
+        result = subprocess.run(
+            ["git", "rev-parse", "--abbrev-ref", "HEAD"],
+            capture_output=True,
+            text=True,
+            timeout=5,
+            cwd=os.path.dirname(os.path.dirname(__file__))
+        )
+        if result.returncode == 0:
+            version_info["git_branch"] = result.stdout.strip()
+
+        # Get last commit date
+        result = subprocess.run(
+            ["git", "log", "-1", "--format=%ci"],
+            capture_output=True,
+            text=True,
+            timeout=5,
+            cwd=os.path.dirname(os.path.dirname(__file__))
+        )
+        if result.returncode == 0:
+            version_info["last_commit_date"] = result.stdout.strip()
+
+    except Exception:
+        version_info["git_info"] = "Not available (not a git repository)"
+
+    # Add file checksums for critical files
+    import hashlib
+    critical_files = [
+        "api/routers/conversation_contexts.py",
+        "api/services/conversation_context_service.py"
+    ]
+
+    checksums = {}
+    base_dir = os.path.dirname(os.path.dirname(__file__))
+    for file_path in critical_files:
+        full_path = os.path.join(base_dir, file_path)
+        try:
+            with open(full_path, 'rb') as f:
+                checksums[file_path] = hashlib.md5(f.read()).hexdigest()[:8]
+        except Exception:
+            checksums[file_path] = "not_found"
+
+    version_info["file_checksums"] = checksums
+
+    return version_info