feat(slopbot): add LLM @mention with agentic Kagi tool calling (t-937)

- Detect @**slop** mentions via MENTION_RE regex
- Agentic loop (MAX_ITER=5): LLM decides when to call kagi_search
- Routing: Parasail primary (model discovery), Ollama qwen2.5:3b fallback
- kagi_search tool: hits Kagi API, returns top-3 snippet results
- Tickers appended to LLM reply when @mention includes $TICKER
- Logging: mention detected, tool calls, Kagi result count, backend used, response
- shell.nix: added openai + requests packages
- requirements.txt: openai>=1.0.0, requests>=2.28.0

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