Fetches real time via HTTP Date header (works through proxy),
sets system clock, and returns formatted local time to the agent.
Also adds MIMI_TIMEZONE config and updates default model to claude-opus-4-5.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Rewrite agent_loop.c with ReAct tool use loop: LLM call → tool
execution → repeat until end_turn (max 10 iterations). Add tool
guidance to system prompt. Add set_search_key CLI command.
Add mimi_secrets.h for build-time credentials with highest priority
over NVS/CLI values. All modules (wifi, telegram, llm, proxy,
web_search) check build-time secrets first, fall back to NVS.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
STA mode, reads SSID/password from NVS, exponential backoff
reconnect (1s-30s), EventGroup for connection state.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
