Server-side cache safety: the session cache now auto-clears after 5 minutes of inactivity.
This handles new chats, context compaction, and session resets without relying on the LLM to call fresh=true. Configurable via LEAN_CTX_CACHE_TTL (seconds, default 300, 0 to disable).
Also removed unused mock-dashboard.html from the repository.
Install: cargo install lean-ctx or brew install yvgude/lean-ctx/lean-ctx