1743df135b
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.