feat(chat): expand conversation history window to 128k

docs(readme): document planner-based rag tool calls and chat sessions

feat(chat): add planner-driven rag tool calls with UI notices

feat(chat): add persistent conversation session management

fix(chat): stabilize citation paper mapping and title display

fix(chat-ui): make citation open select and reveal target paper

feat(chat): include recent conversation history in RAG prompts

fix(chat): avoid garbled fallback text and improve source title fallback

feat(chat-ui): move source metadata into collapsible assistant details

feat(chat): stream assistant responses and fix retrieval panel overflow

feat(frontend): add page-level loading animations

fix(pipeline): hydrate model env from config for resumed jobs

test(frontend): increase vitest timeouts to reduce flaky runs

fix(embed): auto-recover corrupted hnsw index safely

feat(frontend): redesign job history with capped list, filters, and delete actions