fix(bot): chat agent — ГРЛС excerpts in drug check, questions with alcohol answered, retry, clearer logs

Live run through the API (Andrey, real OpenRouter): onset questions now answered from the instruction
excerpt, «можно пиво?» reaches the agent although the check-in records alcohol, quit intent keeps the single
rule reaction, findings are mentioned only for intake/combination questions, one retry on a provider error,
provider error message logged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/llm/agent/__init__.py

@@ -64,6 +64,16 @@ def build_provider(settings: Settings | None = None) -> ToolChatProvider | None:
     return None
 
 
+async def _chat_with_retry(provider: ToolChatProvider, messages: list[dict[str, Any]]):
+    """One retry: OpenRouter occasionally fails a single call (seen live as intermittent ProviderError)."""
+    wire = _wire(messages) if provider.name != "mock" else messages
+    try:
+        return await provider.chat(wire, TOOL_SPECS)
+    except ProviderError as exc:
+        log.warning("chat agent provider=%s retry after %s", provider.name, exc)
+        return await provider.chat(wire, TOOL_SPECS)
+
+
 async def _patient_brief(ctx: ToolContext) -> str:
     """One line of context so the model knows what «мои таблетки» means (drug names only, no identifiers)."""
     rec = await ctx.record()
@@ -99,7 +109,7 @@ async def answer_chat(
     try:
         async with asyncio.timeout(s.chat_agent_timeout_s * 2):
             for _ in range(s.chat_agent_max_steps):
-                turn = await provider.chat(_wire(messages) if provider.name != "mock" else messages, TOOL_SPECS)
+                turn = await _chat_with_retry(provider, messages)
                 if not turn.tool_calls:
                     if not (turn.content or "").strip() and not nudged:
                         # Some models (Gemini Flash) occasionally end with an empty message after tool results.
@@ -127,7 +137,7 @@ async def answer_chat(
             log.warning("chat agent: step limit reached tools=%s", ",".join(ctx.used))
             return None
     except (ProviderError, TimeoutError) as exc:
-        log.error("chat agent provider=%s failed: %s", provider.name, type(exc).__name__ or "timeout")
+        log.error("chat agent provider=%s failed: %s %s", provider.name, type(exc).__name__, exc)
         return None