fix(agent): let retrieval run for non-English low-signal queries

Allow non-workspace low-signal prompts to fall through to tool retrieval so non-English requests are not limited to always-available tools.

src/agent_loop.py

@@ -1801,18 +1801,21 @@ async def stream_agent_loop(
         logger.info(f"[tool-rag] Using caller-provided relevant_tools ({len(_relevant_tools)} tools)")
     if not guide_only and not _relevant_tools and bool(_intent.get("low_signal")):
         from src.tool_index import ALWAYS_AVAILABLE
-        _relevant_tools = set(ALWAYS_AVAILABLE)
         if workspace:
             # An active workspace IS the file-work signal: a vague "look at the
             # project" means explore this folder. Surface only the READ-ONLY file
             # tools (intersection with the plan-mode read-only allowlist) so the
             # agent can investigate; write/shell tools stay out until the request
             # actually calls for them (RAG retrieval adds those on a real ask).
+            _relevant_tools = set(ALWAYS_AVAILABLE)
             from src.tool_security import PLAN_MODE_READONLY_TOOLS
             _relevant_tools |= (_DOMAIN_TOOL_MAP["files"] & PLAN_MODE_READONLY_TOOLS)
             logger.info("[tool-rag] Low-signal but workspace active; including read-only file tools")
         else:
-            logger.info("[tool-rag] Low-signal agent message; skipping retrieval and using always-available tools only")
+            # Don't short-circuit: fall through to RAG retrieval below.
+            # Non-English queries are flagged low_signal by the English-only
+            # intent classifier, but fastembed retrieval works across languages.
+            logger.info("[tool-rag] Low-signal query; will run RAG retrieval")
     if not guide_only and not _relevant_tools:
         try:
             from src.tool_index import get_tool_index, ALWAYS_AVAILABLE