ARCADIA-Studio/harness/release-behavior-canvas-reboot-handoff-20260911.md

Canvas phase 1 — interrupted WIP handoff

Codex-956atf /root/behavior_audit. Implementation stopped immediately on root's user-requested reboot checkpoint, 2026-09-11. Frozen; do not resume until root's post-reboot follow-up.

Workspace: C:/Users/User/Documents/Git/ARCADIA-Studio/.local/behavior-canvas-worktree-20260911 Branch assigned by root: codex/behavior-canvas-20260911 Verified starting commit: c0e66f94e3

This is intentionally unfinished and not compile-coherent. No Cargo/rustc/rustfmt/native/Git mutation was run by this worker. Original checkout was not edited. Root owns WIP commit/push and reboot-safe confirmation. Coordination: issue #2 comment 261; ratified design is release-unified-behavior-canvas-design-20260911.md. User clarification #2/250 explicitly permits semantic sequence constraints.

Exact Rust paths changed

New:

• crates/oa-desktop/src/behavior/canvas_workspace.rs
• crates/oa-desktop/src/behavior/canvas_workspace/viewport.rs

Modified:

• crates/oa-desktop/src/behavior.rs
• crates/oa-desktop/src/behavior/topology.rs
• crates/oa-desktop/src/behavior/topology/direct.rs
• crates/oa-desktop/src/behavior/scenario.rs
• crates/oa-desktop/src/behavior/scenario/workspace.rs

This new handoff is the only report written in the implementation worktree. No App, core, source grammar, REST, schema, architecture/state implementation, existing tests, ledgers or prerequisites files were edited. The earlier design report was written in the original checkout under its prior report-only lease; do not confuse that completed handoff with this interrupted implementation.

Saved implementation so far

• New shared module defines Scope (document/owner/revision), relative Pan and cursor-anchored Zoom events, Camera change helper, a constant-width tooltip palette, and a stable header/canvas/palette host with an overlaid editor. It contains no model commands.
• New generic Iced Viewport wrapper implements focusable state, ordered press-position retention, middle/Space-drag, focused arrow camera keys, wheel zoom, focus border, input capture, child rendering clipped to viewport, and delegated widget operations/overlays. No tests or compiler validated its API usage.
• Behavior declares canvas_workspace. Scene and Graph have a default-zero camera_pan, frame translation and inverse-hit coordinate changes. Existing scroll_offset remains for transitional compatibility; current production views still set/use old scroll offsets.
• Scenario Presentation and process State have a new transient pan. Both expose camera() using the shared relative-input helper. Process enter resets pan with owner/document.
• Both CanvasEvent enums gained Camera(Context, Event), and context() covers it.
• Scenario whole-glyph reorder starts a captured Reorder for a hit occurrence with a row, preserving current-parent slot validation. The current interrupted code selects an unmoved occurrence on release; this was being reviewed against existing press-selection expectations. No process free-placement behavior was added; process semantic SetSteps remains explicitly constrained.

Known incomplete work / blockers

1. canvas_workspace.rs declares mod tests, but canvas_workspace/tests.rs does not exist. Create meaningful mounted tests, not an empty placeholder. No existing test assertions were weakened or changed.
2. New Camera variants have no App handlers; exhaustive matches may fail. Add minimal guarded adapters in App ScenarioCanvas and app/process_canvas.rs, plus Focus/Traverse Tasks. Relative camera events need document/owner/revision validation and correct same-batch ordering; root modal/pending guards must remain intact.
3. Production process/scenario view functions have not been migrated to Fill viewport, the new palette or the stable overlay host. They still use model-sized canvases/Scrollables and split forms. Thus the current source does not deliver phase 1.
4. Pan fields are not yet passed from presentation state into Scene/Graph, and old Fit/manual zoom paths are not reconciled with camera pan. Need explicit Fit reset/recenter and no automatic refit after editor/selection changes.
5. The new Viewport's CursorMoved branch stores the event position, but its subsequent local pointer choice can still prefer Iced's final batch cursor. Correct this before testing; actual event positions must win for ordered movement.
6. Starting camera input should invalidate an in-progress semantic gesture even with zero pan distance. A planned CancelGesture camera intent / epoch bump is not written. Camera input across batches must not lose an active pan solely because its own epoch changed; semantic releases must reject stale contexts.
7. Scope widget focus identity currently omits revision. Review delayed Focus Tasks against replaced modal/document/revision state. Pending structured editors must own keyboard input; a retained background canvas focus must not leak arrows/Space into camera actions.
8. Scenario caller frames already clone Presentation, so they can retain the new pan. Current ScrollRestore receipt machinery still targets the old Canvas Scrollable; migrate actual canvas restoration coherently while preserving Page/outline restoration, exact caller identity, one-shot behavior and raw guards. Process caller restoration/reveal currently targets Scrollable and also needs camera adaptation.
9. Existing scenario FormShown/name focus, one-time marker reveal and staged child-source editor must survive the new stable editor presentation. Keep the same Draft and source_draft state; do not create a second draft, implicit Apply or substitute definitions.
10. Existing workspace/scroll tests target old hosts. Replace obsolete presentation expectations with production-mounted canvas assertions while retaining all semantic/source/history/identity expectations. Do not leave legacy helper-only tests represented as new production acceptance.

Next bounded work after authorization

Finish minimal BOTH-scene Fill/palette/editor adapters, guarded camera App events, stable caller return and whole-glyph scenario reorder. Exercise real Iced root layout and ordered pointer/key batches at nonzero pan and several zooms, frozen canvas bounds across edit/cancel, stale scope/release rejection, modal keyboard ownership, and exact App source/history/raw preservation. Send a coherent source freeze to root for compile and native gates; this worker remains prohibited from running Cargo/native/Git.

No persistent layout map, core/view schema extension, range wrapping, reconnection expansion, new allocation semantics or B4 changes belong in this slice. Root is compiling the original combined c0e66f9 source independently; do not modify that checkout or equate its results with this WIP. The incoming source_draft essentials-first fix is owned by Codex-9e8r6t; B4 renderer by Codex-ytr83r. Phase 1 is not issue #2 completion.

Tool outcome

The first mechanical edit command attempted plain python and failed because python was not on PATH; it changed no files. The same intended edits were then applied successfully with the bundled Python at C:/Users/User/.cache/codex-runtimes/codex-primary-runtime/dependencies/python/python.exe. Shared new files were written through apply_patch. No compile, formatter, unit test or native acceptance has run on these changes.