v0.8.0b4

This is a beta pre-release in the 0.8.0 line. Changes since v0.8.0b3:

Fixed

• MCP source_add bytes upload no longer defaults to an extensionless
  upload.bin. Passing bytes_base64 without an explicit filename used to
  spool the file as upload.bin, which NotebookLM rejected with an HTTP 400
  ("file type unsupported") even for plain text. The filename/extension is now
  seeded from the title and/or mime_type (falling back to upload.bin only
  when neither yields one), so a bytes upload succeeds without a caller-supplied
  filename (#1955).
• Research import is now idempotent. Re-importing a completed research task
  no longer duplicates its sources: import_sources_with_verification (and the
  MCP research_import tool that drives it) pre-filters requested sources whose
  URL already exists in the notebook on every attempt, not only on the
  timeout-retry path. A repeat import adds nothing and reports the skipped
  sources — the MCP result gains newly_imported / already_present (with the
  existing source ids) and a status of already_imported. Pass
  allow_duplicate=True (MCP) to force a re-add. Report / pasted-text entries
  have no dedupable URL and are unaffected
  (#1961).
• chat.ask() (and the chat_ask MCP tool / AskResult) now report
  is_follow_up=True when an implicit ask (no conversation_id) continues the
  notebook's existing current conversation, instead of always reporting False
  on the implicit path. A genuinely new (first-ever) conversation still reports
  is_follow_up=False
  (#1965).
• A missing optional-dependency error now points at the right fix. Reading a
  source with output_format="markdown" without the markdownify extra
  installed used to report the wrong remediation ("Check the auth profile /
  storage configuration.") because the missing-extra error was classified as a
  configuration error. It now raises a dedicated MissingDependencyError
  (classified as a new DEPENDENCY category) whose hint names the install
  command — e.g. pip install 'notebooklm-py[markdown]' — across the MCP
  (DEPENDENCY code) and REST (dependency / HTTP 500) surfaces
  (#1959).

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Install with pip install --pre notebooklm-py==0.8.0b4. Full 0.8.0 cycle changelog: CHANGELOG.md.