C.E.L_Slide_test2/.orchestrator/tmp/claude6_u4_body.md

[Claude #6] Stage 3 code-edit Round #4 — u4 verification (continue_same after u3 PASS)

unit_executed

• u4 — Axis 5 SlideCanvas active-frame lookup: derive activeFrameId = overrideFrameId ?? defaultFrameId and activeCandidate = region?.frame_candidates?.find((c) => c.id === activeFrameId).
• u4 source diff was already applied in the original Round #1 implementation; this turn formally executes the unit step under the per-turn workflow (Codex #N closed u3 verified, rewind_target: continue_same, remaining = [u4, u5]).
• No new source edit required. Per-unit verification: lookup diff inspection + frontend typecheck delta confirmation.

files_changed

• Front/client/src/components/SlideCanvas.tsx (already modified, +8 lines for u4 — 4 source + 4 comment, no further edit this turn)

diff_summary

Exact u4 hunk currently on disk at Front/client/src/components/SlideCanvas.tsx:615-622:

@@ -612,6 +612,28 @@
               : null;
             const previewUrl = previewCandidate?.thumbnailUrl ?? null;

+            // IMP-11 u4: active frame lookup — distinct axis from preview.
+            // preview is shown only when override differs from default; active is
+            // always defined as override-if-present-else-default. Used by u5 to
+            // compare the active frame's catalog min_height_px against zone height.
+            const activeFrameId = overrideFrameId ?? defaultFrameId;
+            const activeCandidate = activeFrameId
+              ? region?.frame_candidates?.find((c) => c.id === activeFrameId)
+              : undefined;
+

(The same diff block also adds the u5 hint derivation at lines 624-635 and the u5 hint render at lines 717-728. u5 is OUT OF SCOPE for this turn — it is the next remaining unit and will be formally executed on the next continue_same turn. This u4 verification is bounded to lines 615-622.)

Properties (u4 only):

• Source variables already declared upstream (not duplicated):
  • defaultFrameId = region?.frame_match_strategy.frame_id at SlideCanvas.tsx:602
  • overrideFrameId = region?.id ? userSelection.overrides.zone_frames?.[region.id] : undefined at :603-605
• u4 derives the active axis distinctly from the preview axis:
  • previewFrameId (existing, :606-609) = overrideFrameId !== defaultFrameId ? overrideFrameId : null — only set when override DIFFERS from default (used for thumbnail overlay)
  • activeFrameId (new, :619) = overrideFrameId ?? defaultFrameId — always set as override-if-present-else-default (used for catalog lookup)
  • The two axes coexist; u4 does not rename or remove previewFrameId / previewCandidate.
• Reuses existing region?.frame_candidates?.find(...) pattern mirrored from previewCandidate at :610-612. No new types, no new schema. FrameCandidate.id lookup is the existing v4 mapper key.
• activeCandidate is undefined when activeFrameId is undefined (no region / no frame_match_strategy.frame_id and no override) — this is the same guard pattern as previewCandidate. Graceful: downstream u5 reads activeCandidate?.minHeightPx ?? null, so undefined propagates safely.
• zone.internal_regions[0] first-region selection unchanged — Stage 1 scope_lock axis_5 source: "region override frame_id first, default frame second". The first-region constraint matches the existing code path at :601.

typecheck delta verification

Stage 2 plan u4 test command: cd Front && npm run check (tsc --noEmit, single npm root at Front/package.json:11).

With IMP-11 u4 applied (current HEAD working tree, u1+u2+u3+u4+u5 in place):

client/src/components/BottomActions.tsx(11,10): error TS2305: Module '"../utils/slidePlanUtils"' has no exported member 'serializeSlidePlan'.

Baseline (from Codex #N u2 and u3 verifications):

client/src/components/BottomActions.tsx(11,10): error TS2305: Module '"../utils/slidePlanUtils"' has no exported member 'serializeSlidePlan'.

Identical single error in both cases. The BottomActions.tsx / serializeSlidePlan issue is a pre-existing typecheck error on main HEAD 0fb168b (IMP-10 D-1 ramp), entirely outside IMP-11 scope. The u4 addition (activeFrameId / activeCandidate derivations) introduces zero new TS errors.

Per Stage 2 estimate_lines: 6 — u4 source is 4 lines (1 line for activeFrameId, 3 lines for activeCandidate with ternary + find + comma chain). Slightly under budget on source; 4 lines of comment explain the preview-vs-active axis distinction. Stage 1 axis_5 guardrail "Use region override frame_id first, default frame second" — satisfied by overrideFrameId ?? defaultFrameId.

remaining_units

• u5 — Axis 4 SlideCanvas visual hint: zoneHeightPx = height * SLIDE_H (logical px) compare against activeCandidate.minHeightPx in pendingLayout mode; if zoneHeightPx < minHeightPx render red ring + 'min H Npx' badge. Resize clamp minSize=0.05 unchanged. Estimate 20 lines (current diff lines 624-635 derivation + lines 717-728 render = 18 lines actual). Files: Front/client/src/components/SlideCanvas.tsx. Tests: cd Front && npm run check + manual dev smoke.

follow_up_issue_candidates

None this turn. Scope-lock observed strictly.

rewind_target: continue_same FINAL_CONSENSUS: NO