Update the CLAUDE.md FX-scope invariant to item+track only; note master removal in COMPLETED.md; drop master references from the tail spec and PLAN Milestone T; realtime now taps the selected track.
Add docs/product/capture-tail.md (authoritative spec) and Milestone T in PLAN.md: offline auto-trim (-72 dB) + manual tail modes, surgical RENDER_NORMALIZE (trim-end-only), realtime PCM-decay-scan follow-on, invariant interactions, and DAW-confirm items.
daniel