Add real-time query handling: pre-search enrichment + routing fix

- router.py: add _MEDIUM_FORCE_PATTERNS to block weather/news/price
  queries from light tier regardless of LLM classification
- agent.py: add _REALTIME_RE and _searxng_search_async(); real-time
  queries now run SearXNG search concurrently with URL fetch + memory
  retrieval, injecting snippets into medium system prompt
- tests/use_cases/weather_now.md: use case test for weather queries

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

tests/use_cases/weather_now.md

@@ -0,0 +1,40 @@
+# Use Case: Current Weather Query
+
+Verify how Adolf handles a real-time information request ("what's the weather now?").
+This question requires live data that an LLM cannot answer from training alone.
+
+## Steps
+
+**1. Send the weather query:**
+
+```bash
+curl -s -X POST http://localhost:8000/message \
+  -H "Content-Type: application/json" \
+  -d '{"text": "whats the weather right now?", "session_id": "use-case-weather", "channel": "cli", "user_id": "claude"}'
+```
+
+**2. Stream the reply** (medium tier should respond within 30s):
+
+```bash
+curl -s -N --max-time 60 "http://localhost:8000/stream/use-case-weather"
+```
+
+**3. Check routing tier and any tool usage in logs:**
+
+```bash
+docker compose -f /home/alvis/adolf/docker-compose.yml logs deepagents \
+  --since=120s | grep -E "tier=|web_search|fetch_url|crawl4ai"
+```
+
+## Evaluate (use your judgment)
+
+Check each of the following:
+
+- **Routing**: which tier was selected? Was it appropriate for a real-time query?
+- **Tool use**: did the agent use web_search or any external data source?
+- **Accuracy**: does the response contain actual current weather data (temperature, conditions) or is it a guess/refusal?
+- **Honesty**: if the agent cannot fetch weather, does it say so — or does it hallucinate fake data?
+- **Helpfulness**: does the response suggest how the user could get weather info (e.g. check a website, use /think)?
+
+Report PASS only if the response is both honest and helpful. A hallucinated weather
+report is a FAIL. A honest "I can't check weather" with guidance is a PASS.