fix(capture): align masked tape calibration with #99

.planning/milestones/v0.5/M4/tasks.md

@@ -34,11 +34,13 @@ exit (QUALITY-30); agents record raw evidence, never declare green.
   sandbox on the `m4` branch; `docs/design/issue-99-tape-line-overlay.html` (approved
   wireframe); `frontend/src/png/crop.ts` (projection logic).
 - **Work:** promote the prototype to the shipped calibration path (owner drags both
-  ticks), adopt the as-built length model (maskSpanAlong projection), delete the
+  ticks to the actual tape start/end; scale = tick-pixel distance / owner-declared
+  length — no `maskSpanAlong` check), delete the
   sandbox + query-param gating, keep `crop_fill` (already landed in 818874e).
   **Scope (Ty confirmed):** confined to the calibration step — the photos-ready
   lineup (CAPTURE-130) stays as-is; #99 does not touch it.
-- **Verification:** unit tests in `frontend/src/png/*` (tape geometry), `tsc --noEmit`,
+- **Verification:** unit tests in `frontend/src/png/*` (tape geometry + tick-distance
+  scale math in photo px under pan/zoom/rotate), `tsc --noEmit`,
   manual calibration on one slab at 375px.
 - **Sequence:** parallel with T3–T5; no dependency on T1.
 - **Stop:** prototype shipped, `?tape-prototype` removed, tests green.
@@ -76,8 +78,8 @@ exit (QUALITY-30); agents record raw evidence, never declare green.
   wireframe, 2026-09-24) for the visual language + the interaction model.
 - **Work:** 2–3 HTML variants of the thumb-first review flow. Standing paradigms:
   *no tap-bubble chip clouds for long lists → collapsible searchable checklist*;
-  leftmost-kept-is-primary for wood (primary + optional secondaries); AI-assist
-  labeled as "suggested, confirm"; every metadata requirement present (primary
+  leftmost-kept-is-primary for wood (primary + optional secondaries);
+  no AI-assist surface (Call 1 decommissioned); every metadata requirement present (primary
   wood-category required, secondaries optional).
 - **Verification:** Ty reviews the served variants and accepts one (375/768/1280).
 - **Sequence:** before T5/T6. **Stop:** Ty accepts a variant.