UI: send-on-Enter + live reasoning trace; docs: answer-cache decision (#106)

Let the planner choose the content space: search_docs gains a kind filter

Codebase quality pass: kill silent-truncation hacks, fix latent bugs, cover them (#46)

Fix LLM transport drift, wire live static checks, clean config (#39)

Loop: always retrieve once before the planner (robust to flaky free models)

M3: three tools + manual agent loop (planner-driven, budgeted)