feat(api): inject folder manifest into home agent when project context active

Add optional project_id param to run_home_stream. When set, fetch the linked
folder manifest via _fetch_project_manifest and prepend the <linked_folder>
block to the system prompt. Also build an explicit tools list that extends
_all_tools_for_user with FOLDER_TOOLS so the home agent can read folder
files. device_ws._handle_home_request extracts project_id / projectId from
the home_request frame and forwards it to the runner.

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

app/core/deep_agent.py

@@ -1378,9 +1378,22 @@ async def run_home_stream(
     user_id: str,
     message: str,
     context: dict[str, Any],
+    project_id: str | None = None,
 ) -> AsyncGenerator[tuple[str, Any], None]:
+    from app.agents.folder_agent import FOLDER_TOOLS
+
     prepared_context = await _prepare_context(message, context)
     system_prompt, langfuse_prompt = _build_system_prompt("home_system", _HOME_SYSTEM_PROMPT, prepared_context)
+
+    manifest_block = ""
+    if project_id:
+        manifest = await _fetch_project_manifest(project_id)
+        manifest_block = format_folder_manifest(manifest)
+    system_prompt = system_prompt + ("\n\n" + manifest_block if manifest_block else "")
+
+    trace_id = _trace_id_from_context(prepared_context)
+    tools = [*_all_tools_for_user(user_id, trace_id), *FOLDER_TOOLS]
+
     text_chunks: list[str] = []
     async for event in _run_single_agent_stream(
         user_id=user_id,
@@ -1389,6 +1402,7 @@ async def run_home_stream(
         context=prepared_context,
         langfuse_prompt=langfuse_prompt,
         agent_name="home-agent",
+        tools=tools,
         conversation_history=context.get("conversation_history"),
     ):
         event_type, data = event