docs(design): record video preparation integration

.project-docs/30-worklog/tasks/20260916-merge-design-video-client-4f6d28a1.md

@@ -0,0 +1,44 @@
+# Task: Integrate Design video preparation into main
+
+## Identity
+
+- Task ID: 20260916-merge-design-video-client-4f6d28a1
+- Mode: Integration
+- Branch: main
+- Worktree: D:\Datas\OthersProjects\makelore
+- Base commit: b723c7220bfbc4922f5b25265ac7e64306cb6347
+- Owner: codex
+- Status: Ready for Integration
+
+## Scope
+
+- Integrate the completed Design video preparation source 1acca836fe035dd462110cdc7683645c1e031f54 into local main and reconcile its accepted Design contracts. Own only this integration record and relevant canonical Design memory; imported source records remain unchanged.
+
+## Intent And Constraints
+
+- User explicitly authorized releasing old task 20260915-merge-image-preview-56ab481e, adopting this root while preserving its 3 known foreign documents, and releasing this integration ownership after completion. No push, deployment, paid generation or worktree deletion is authorized.
+- Concurrent and Planning Gates passed: exclusive integration ownership matches this root/branch/base; entry, source outcomes, Design ADR, domain, architecture and relevant evidence/commitment context were loaded. Historical peer records remain read-only; placeholder scopes are unknown and are not integration sources.
+- Preserve Current Specification authority, immutable revision-bound Quote and explicit confirmation. Preparation does not create chat Turns or paid media Tasks. Source and client/server counterparts must be released together.
+- Preserved foreign paths: .project-docs/30-worklog/tasks/20260901-package-122-c5e8.md, .project-docs/30-worklog/tasks/20260901-package-123-d7f3.md, .project-docs/30-worklog/tasks/20260902-client-hang-diagnosis-a47c9e2b.md. Their original bytes and index state are retained; never stage them.
+
+## Outcome
+
+- Fast-forwarded local main from b723c7220bfbc4922f5b25265ac7e64306cb6347 to exact source 1acca836fe035dd462110cdc7683645c1e031f54; no merge conflict or product rewrite. Source task record imported unchanged from its retained branch.
+- Promoted the user-approved preparation/capability/binding contract to the accepted Design ADR and domain rules and recorded source provenance in current-state. This clarifies the explicit video starting-image selection; it does not introduce another semantic authority or bypass confirmation.
+- The 3 known foreign dirty documents remain outside staging and are retained. User-authorized integration ownership release is performed only after final documentation/commit checks.
+
+## Verification
+
+- Root verification after fast-forward: five related unit files, 76 tests passed in 4.48s. pnpm run typecheck and pnpm run build:vite passed; Renderer/Main/Preload/utility targets built successfully. Existing Browserslist, mixed-import and chunk-size warnings remain. No installer packaging or Electron E2E run in this integration.
+- Paired main-branch verification: DESIGN_DIAGNOSTIC_SERVER points to the actual server master root; the client diagnostic passed 2 tests in 13.31s. Actual React/store preparation commands reach the real Python Workspace/compiler bridge, with zero blockers before quotation; the test then explicitly confirms. Separate backend lifecycle coverage proves persisted Task execution and ready Asset projection with provider/storage/ledger fixtures.
+- Tests do not establish real model quality, installed-app WebSocket transport, production staging/storage or MP4 decoding. No live model/provider, paid generation, push or deployment was performed.
+- check_project_docs, task-aware check_doc_drift and git diff --check passed. Product/index comparison against the exact source is empty; all 3 preserved foreign files match their pre-adoption bytes and none are staged. Source worktree is clean and its latest HEAD is now included in the local main branch.
+
+## Follow-ups
+
+- After paired deployment, separately authorize a real short-video acceptance covering image staging, model output, ingestion and actual playback. Local fixture-backed tests do not prove production availability.
+- Source worktree cleanup offered with its full path/branch; awaiting confirmation. Retain its checkout, branch and commits unless separately approved. This does not hold up the completed merge.
+
+## Promotion Candidates
+
+- Applied the completed source's accepted Design preparation proposal without changing unrelated product direction. Source task files remain read-only.