Settle the reshaped Milestone 10: thin capture-recipe fingerprint and
bank-only re-capture; P3/P4 closed as moot. Remove the pending-picks
banner in PLAN.md and stamp the provenance product note as settled.
Cut the null-test verify action and pre-FX-dry mechanism (Daniel's
call); keep provenance + re-capture-from-source. Sample.provenance
already exists/round-trips (M1), so M10 populates and consumes it. Add
docs/product/provenance.md with dual-canvas forks P1-P4 and the leaned
bank-only path; rewrite PLAN.md M10 as a proposal pending fork picks.
daniel