m's lock-in 2026-05-07: agree with all recommendations on Q1-Q18 and §10
Q19-Q27, with one correction on Q4: "activity" is a content selection
(sources + filters), not a render shape. Folded into `list` shape with
density: "compact" + actor/time columns. Shape ⊥ source — any source can
render in any shape.
Render shapes for v1: list / cards / calendar (3, was 4).
PR split decision (delegated to inventor): A1 backend substrate + API
(no UI change, ~1800 LoC, smoke via curl) → main → A2 frontend Custom
Views UI (~1600 LoC, additive on A1) → main.
Status flipped DRAFT → LOCKED. Inventor → coder transition initiated.
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