muse-tracker 0.0.9

• Langfuse auth works with a standard Muse card. Verified against a real
  Langfuse v4.67.0: a bearer secret key has full project access (a bearer
  public key reaches only scores). Setup now requests the same api_key /
  bearer_header card as Braintrust, holding the secret key, with a
  Basic-header card as the fallback.
• Langfuse plan limits. Existence checks are one query per page window
  (by the agent's tag) instead of one per trace; reads are spaced to stay under
  Hobby's 30 a minute; batches are sized on the OTLP body (≤ 4 MB); a backfill
  older than the plan's read window (langfuseReadWindowDays, 30) needs
  --beyond-read-window.
• A send that failed without an answer is checked only once it is
  langfuseVisibilitySeconds old: real Langfuse makes spans readable a few
  seconds after accepting them.
• tests/e2e.py --langfuse-live URL runs the Langfuse phases against a real
  server through a stand-in for Muse's Secure Vault.