v0.9.1

Added

• Chat session management (#256) — list, view, export, and save past notebook chats.
  • CLI: nlm chats list <notebook>, nlm chats get <notebook> [conversation_id], nlm chats export <notebook> [conversation_id] --format md|json --output file, and nlm chats to-note <notebook> <conversation_id> [--turn N] [--title ...].
  • MCP tools: chat_list, chat_get, chat_export.
  • Transcripts are fetched from NotebookLM's server (a newly-documented khqZz RPC, see docs/API_REFERENCE.md), so past chats are visible even from a fresh CLI invocation or MCP session — not just chats made earlier in the same process.
  • Documented in SKILL.md, AGENTS_SECTION.md's command_reference.md, docs/CLI_GUIDE.md, docs/MCP_GUIDE.md, README.md, and AGENTS.md.

Fixed

• Preserve profile email across token updates (#266) — AuthManager.save_profile() now preserves the existing stored profile email from metadata.json when email=None is passed during background CSRF updates, token refreshes, and save_tokens_to_cache() calls.
• Chat session tools now respect the configured default profile — services/chats.py no longer hardcodes profile "default"; it now falls back to get_config().auth.default_profile like the rest of the CLI/MCP client resolution, so chat_list/chat_get/chat_export and nlm chats ... work correctly for accounts using nlm login switch.
• nlm chats to-note / save_chat_to_note now creates the note correctly — it was calling notes_service.create_note() with the wrong signature (notebook=/profile= keyword args instead of the required (client, notebook_id, content, title)), which raised a TypeError at runtime. Never shipped, caught before release via live testing.
• chat_list/chat_get/chat_export are now hideable via NOTEBOOKLM_DISABLED_GROUPS — added to the chat tool group in tool_groups.py, which previously covered only notebook_query/chat_configure/notebook_query_start/notebook_query_status.
• Tool count corrected to 43 across all docs — label, notebook_query_start, and notebook_query_status were registered MCP tools missing from mcp/tools/__init__.py's __all__ and from docs/MCP_GUIDE.md (which also separately lacked source_rename and notebook_share_batch). Fixed the export list and documented every tool; updated the stale "40 tools" (and one "39 tools") count in README.md, the desktop extension manifest, SKILL.md, and docs/MCP_CLI_TEST_PLAN.md. Added a regression test (test_groups_cover_every_registered_tool) so a new tool shipping without a tool_groups.py entry fails CI instead of silently drifting.