Phase 536: lasso screenshot route and Cookbook proof boundary

docs/en/phase-0-reactflow-parity-audit.md

@@ -186,6 +186,10 @@ Phase 534 is GitHub #191 / `avalonia-node-map-lzy`, the lasso visual gesture fee
 
 Phase 535 is GitHub #193 / `avalonia-node-map-8l6`, the post-Phase-534 parity queue refresh. This docs/tests-only slice records Phase 534 as closed and turns the remaining whiteboard pressure into tracker-backed follow-up candidates for lasso screenshot proof, lasso toolbar UX/public activation ergonomics, eraser behavior/API feasibility, rectangle/freehand drawing primitives, and whiteboard persistence/render-layer readiness. It authorizes no runtime behavior changes, no public API changes, no UI redesign, no screenshot manifest expansion, no strict pixel baseline enforcement, no retained API removal, and no whiteboard implementation.
 
+## Phase 536 Update
+
+Phase 536 is GitHub #195 / `avalonia-node-map-uvd`, the lasso screenshot route and Cookbook proof boundary. This implementation slice adds the scene route `cookbook-interaction-lasso-screenshot-proof` / `interaction-lasso-screenshot-proof-route` on the existing `selection-marquee-workbench` fixture and the shell state `shell-cookbook-lasso-screenshot-proof`. The shell state targets `PART_NodeCanvas`, sets `NodeCanvasSelectionMode.Lasso`, captures the active transient lasso path before release, and records `full-window-shell-lasso-state` metadata tied to `LassoSelectionMode_RendersTransientFeedbackPathOnlyDuringDrag` plus proof marker `LASSO_SCREENSHOT_PROOF_BOUNDARY_OK`. It authorizes no toolbar UX, no eraser behavior, no drawing primitives, no persistence, no renderer rewrite, no strict pixel baseline enforcement, no retained API removal, and no full whiteboard parity.
+
 ## Phase 489 Update
 
 Phase 489 closed GitHub #101 / `avalonia-node-map-6sc` through PR #102 as a renderer virtualization design spike on branch `perf/renderer-virtualization-spike`. This slice was docs/tests only: it defined the proof contract required before any future ItemsRepeater/Skia-style renderer virtualization, background graph index, or graph-size claim expansion. It made no public API change and no runtime change. The current evidence remains viewport-budgeted scene projection/rendering, not a true renderer virtualization contract; `xlarge` stays telemetry-only.
@@ -489,10 +493,12 @@ Phase 533 adds public lasso pointer-mode activation through GitHub #189 / `avalo
 
 Phase 534 adds the lasso visual gesture feedback route through GitHub #191 / `avalonia-node-map-lzy`. It renders a transient lasso path on the existing `OverlayLayer` during active lasso drags through `UpdateLassoFeedback(...)` and clears it through `ClearLassoFeedback()` on release or capture loss, while retaining toolbar UX, lasso screenshot route, eraser tool behavior, drawing primitives, persistence, renderer layer, React Flow-like examples, and full React Flow whiteboard parity as gaps.
 
+Phase 536 adds the bounded lasso screenshot proof through GitHub #195 / `avalonia-node-map-uvd`. It adds `cookbook-interaction-lasso-screenshot-proof`, `interaction-lasso-screenshot-proof-route`, and `shell-cookbook-lasso-screenshot-proof` as visual evidence for the existing transient lasso path, while retaining toolbar UX, eraser behavior, drawing primitives, persistence, renderer rewrite, strict pixel baseline enforcement, retained API removal, and full whiteboard parity as gaps.
+
 | GitHub | Bead | Title | Priority | Likely write set | Parallelism |
 | --- | --- | --- | --- | --- | --- |
 | #193 | `avalonia-node-map-8l6` | Phase 535: refresh post-lasso visual feedback parity queue | P2 | parity roadmap docs and focused docs tests | Current docs/test queue refresh. Blocks the next implementation wave because it replaces the stale Phase 534 current row with tracker-backed follow-ups. |
-| TBD | TBD | Phase 536: lasso screenshot route and Cookbook proof boundary | P2 | Cookbook screenshot manifest, Demo fixture route, scene/shell screenshot tests, and parity docs | Ready after Phase 535. Sequential with lasso toolbar work because both may touch lasso Cookbook route copy and screenshot documentation. |
+| #195 | `avalonia-node-map-uvd` | Phase 536: lasso screenshot route and Cookbook proof boundary | P2 | Cookbook screenshot manifest, Demo fixture route, scene/shell screenshot tests, and parity docs | Current visual proof slice. Blocks lasso toolbar work until the screenshot route and Cookbook proof boundary are stable. |
 | TBD | TBD | Phase 537: lasso toolbar UX and public activation ergonomics boundary | P2 | hosted authoring tools, `NodeCanvas.SelectionMode` activation surface, Demo/Cookbook route, and editor/Avalonia tests | Ready after Phase 535. Do not run in parallel with Phase 536 if both need the same lasso route text or visual proof fixture. |
 | TBD | TBD | Phase 538: eraser behavior/API feasibility gate | P3 | editor selection/delete commands, Avalonia hit-testing route, parity docs, and focused feasibility tests | Can run after Phase 535 in parallel with drawing model planning if it avoids shared pointer-mode state edits. |
 | TBD | TBD | Phase 539: rectangle/freehand drawing primitive model gate | P3 | Core/Editor model contract docs/tests and whiteboard primitive API inventory | Can run after Phase 535 in parallel with eraser feasibility if it stays docs/model-only and does not touch Avalonia pointer coordinators. |
@@ -533,7 +539,7 @@ Phase 534 adds the lasso visual gesture feedback route through GitHub #191 / `av
 - `docs/phase-527-background-variant-gate`: owns #177 / `avalonia-node-map-dim`; current docs/test worktree for the Background variant public surface gate.
 - `docs/phase-528-panel-overlay-boundary`: owns #179 / `avalonia-node-map-9ow`; current docs/test worktree for the Panel versus viewport-attached overlay boundary.
 - `docs/phase-535-post-lasso-queue-refresh`: owns #193 / `avalonia-node-map-8l6`; current docs/test queue refresh after transient lasso feedback, with no runtime/API/UI/screenshot-manifest/whiteboard implementation changes.
-- `visual/phase-536-lasso-screenshot-proof`: future candidate for the first lasso screenshot route and Cookbook proof boundary after Phase 535.
+- `visual/phase-536-lasso-screenshot-proof`: owns #195 / `avalonia-node-map-uvd`; current slice for `cookbook-interaction-lasso-screenshot-proof`, `shell-cookbook-lasso-screenshot-proof`, and the bounded lasso screenshot proof boundary.
 - `feature/phase-537-lasso-toolbar-ergonomics`: future candidate for lasso toolbar UX and public activation ergonomics after Phase 535.
 - `feature/phase-538-eraser-feasibility`: future candidate for eraser behavior/API feasibility after Phase 535.
 - `docs/phase-539-drawing-primitive-model-gate`: future candidate for rectangle/freehand drawing primitive model decisions after Phase 535.
@@ -591,4 +597,5 @@ Current coverage includes scene-level route captures plus ten manifest-driven fu
 - Phase 530 is GitHub #183 / `avalonia-node-map-8um`; it adds the backend/editor lasso selection query contract without Avalonia gesture capture, pointer-mode state machine, eraser behavior, drawing primitives, persistence, renderer changes, screenshot manifest expansion, strict visual-baseline enforcement, retained API removal, or a full React Flow whiteboard parity claim.
 - Phase 534 is GitHub #191 / `avalonia-node-map-lzy`; it adds transient lasso visual gesture feedback without toolbar UX, lasso screenshot route, eraser behavior, drawing primitives, persistence, renderer changes, screenshot manifest expansion, strict visual-baseline enforcement, retained API removal, or a full React Flow whiteboard parity claim.
 - Phase 535 is GitHub #193 / `avalonia-node-map-8l6`; it refreshes the post-Phase-534 parity queue without runtime behavior changes, public API changes, UI redesign, screenshot manifest expansion, strict pixel baseline enforcement, retained API removal, or whiteboard implementation.
+- Phase 536 is GitHub #195 / `avalonia-node-map-uvd`; it adds `cookbook-interaction-lasso-screenshot-proof`, `interaction-lasso-screenshot-proof-route`, `shell-cookbook-lasso-screenshot-proof`, `full-window-shell-lasso-state`, and `LASSO_SCREENSHOT_PROOF_BOUNDARY_OK` without toolbar UX, eraser behavior, drawing primitives, persistence, renderer rewrite, strict pixel baseline enforcement, retained API removal, or full whiteboard parity.
 - Product code remains out of scope for Phase 478, Phase 484, Phase 490, Phase 491, Phase 492, Phase 493, Phase 494, Phase 495, Phase 497, Phase 498, Phase 499, Phase 500, Phase 501, Phase 502, Phase 503, Phase 504, Phase 505, Phase 506, Phase 507, Phase 508, Phase 509, Phase 510, Phase 511, Phase 512, Phase 513, Phase 520, Phase 521, Phase 522, Phase 523, Phase 524, Phase 525, Phase 526, Phase 527, Phase 528, Phase 529, and Phase 535 unless a focused test proves a specific missing contract.