Magpie v0.1.0-beta.4

docs: CONTINUE.md — session handoff for resuming the quality work

State of shipped fixes and measured numbers, the in-flight
transcribe-at-index experiment with its pre-registered gate, the
machine-bound data that does not travel with the repo, house rules
(strict binary, one variable, sealed held-out), ranked open cards,
and the gotchas. No personal data — refers to local-only files by name.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>