fix: handle mode as string due to use_enum_values=True

The BaseSchema has use_enum_values=True which makes Pydantic store
enum values as strings. Added _get_mode() helper to convert back to
PermissionMode enum before passing to agent methods.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

webber-api/src/domains/agents/router.py

@@ -23,6 +23,13 @@ from src.domains.agents.schemas import (
     AgentListResponse,
     PermissionMode,
 )
+
+
+def _get_mode(mode_value: str | PermissionMode) -> PermissionMode:
+    """Convert mode string to enum (handles use_enum_values=True)."""
+    if isinstance(mode_value, PermissionMode):
+        return mode_value
+    return PermissionMode(mode_value)
 from src.shared.logging import logged, get_logger
 
 logger = get_logger(__name__)
@@ -56,18 +63,21 @@ async def run_agent(request: AgentRunRequest) -> AgentRunResponse:
             detail=f"Unknown agent type: {request.agent_type}"
         )
 
+    # Convert mode string to enum (use_enum_values=True in schema)
+    mode = _get_mode(request.mode)
+
     try:
         # Run the agent with mode
         response = await agent.run(
             request.prompt,
             working_dir=request.working_dir,
-            mode=request.mode,
+            mode=mode,
         )
 
         return AgentRunResponse(
             response=response,
             agent_type=request.agent_type,
-            mode=request.mode,
+            mode=request.mode,  # Keep original for response
             success=True,
         )
 
@@ -103,19 +113,22 @@ async def stream_agent(request: AgentRunRequest) -> StreamingResponse:
             detail=f"Unknown agent type: {request.agent_type}"
         )
 
+    # Convert mode string to enum (use_enum_values=True in schema)
+    mode = _get_mode(request.mode)
+
     async def generate():
         try:
             async for chunk in agent.run_stream(
                 request.prompt,
                 working_dir=request.working_dir,
-                mode=request.mode,
+                mode=mode,
             ):
                 # SSE format: data: {json}\n\n
                 event = {"event": "chunk", "data": chunk}
                 yield f"data: {json.dumps(event)}\n\n"
 
             # Signal completion
-            yield f"data: {json.dumps({'event': 'done', 'mode': request.mode.value})}\n\n"
+            yield f"data: {json.dumps({'event': 'done', 'mode': mode.value})}\n\n"
 
         except Exception as e:
             logger.exception(f"Stream error: {e}")