[SCcagg5]

Part of a stack of 31 pull requests that depend on each other. They must be reviewed and merged in order: each PR builds on the previous one and its diff only contains its own changes.

• Previous: PR 8
• Next: PR 10

All PRs of the stack

#	PR
1	specs: Add spec 083 and the samples store
2	ir: Add run state fields for ephemeral runs and reused outputs
3	runtime: Bound continuous steps and carry outputs of selected steps
4	api: Add step samples, events, availability and selected-step runs
5	test(ui): add YAML fixtures for the document model tests
6	ui(lib): add shared UI kit, status helpers and right-panel shell
7	ui(canvas): add canvas engine core, toolbars and editor helpers
8	ui(i18n): add workspace message catalogs, first batch
9	ui(canvas): add canvas Flow view, step run panel and workflow panel
10	ui(editor): add YAML document model, canvas model and run source logic
11	ui(editor): Add edit session, YAML format and quick fixes, run actions, tab strip
12	ui(editor): Add canvas graph model, Add step panel, issues popover, run bar
13	ui(canvas): Add layered layout, dependency edges, status styles, reference picker
14	ui(canvas): Add export, flow builder, upstream data panel, output capture
15	ui(canvas): Add node cards, launchers, inspector sections, client issues
16	ui(editor): Add visual editor, step inspector and YAML file panel
17	ui(lists): Open runs on the workflow page; add tab and schedule helpers
18	ui(workspace): Add workspace URL state, legacy redirects and run list links
19	ui(workspace): Add workspace data layer, run facts and Workflow panel
20	ui(workspace): Add run start controls, visible runs and reuse source
21	ui(workspace): Add data provider, bar identity, continuous panel and step list
22	ui(logs): Add run actions cluster, cached logs and log popout page
23	ui(workspace): Add Activity dock, step run view and workflow page
24	test(workspace): Add integration tests for the workspace shell and step view
25	ui(pages): Retire classic run pages and open runs on the workflow page
26	test(editor): Add integration tests for the editor, inspector and run overlay
27	test(ui): Add repository-wide guard tests and ESLint boundary rules
28	e2e: Add workspace helpers and fixtures, update existing specs
29	e2e: Add workspace specs, part 1 of 2
30	e2e: Add workspace specs, part 2 of 2
31	examples: Add the workspace demo workflows

Stack 9/31. Base branch: stack/08-ui03. Review and merge in order; this PR builds on the previous one.
Size: 47 files changed, 7290 insertions(+), 108 deletions(-).
Checked: Typecheck (tsc) of the whole UI and the unit tests of this PR (Vitest), on top of the previous PR.

Summary

This PR adds the canvas view layer (Flow, Handle, edge parts, overlays), the step run panel with input provenance and output cache, the workflow side panel, and the YAML name and reference operations. It also adds the rest of the message modules and their index.

Why

PR 7 gave the engine its geometry and store. This PR adds the drawing and the pointer handling on top, and the run-related logic for step runs that reuse outputs of earlier runs. The document model comes in PR 10; the pages come later in the stack.

Changes

• 47 files: 43 new, 4 modified.
• Engine view (canvas/engine): Flow.tsx (pan, zoom, drag, selection), Handle.tsx, edgeParts.tsx, overlays.tsx (Background, Controls, MiniMap, Panel), index.ts.
• Step runs (visual-editor/run): StepRunPanel.tsx, inputProvenance.ts (where reused outputs come from: a run or the browser cache), outputCache.ts (references to runs, with step hashes), stepRunInfo.ts. api/useStepOutputs.ts reads stored outputs of a step.
• Values: references/JsonValue.tsx (pretty JSON with folding and a size limit).
• Document logic (visual-editor/doc): names.ts (step name and id rules), ops/references.ts (rewrite ${steps.x.outputs.y} references), salvage.ts (read the good steps of a broken file).
• Workflow panel (dags/components/dag-editor): WorkflowPanel, DocumentSwitcher, workflowLabels; DAGAttributes is reworked; WorkflowDrawer in visual-editor.
• select.tsx uses the raised layer class from PR 6; AgentSpecOverview has a small change.
• Messages: messages/index.ts merges the modules from PR 7, PR 8 and PR 9, and 12 more modules (w4n6b to ya1) are added.

How to review

1. engine/Flow.tsx, then Handle.tsx, edgeParts.tsx.
2. engine/overlays.tsx.
3. outputCache.ts, inputProvenance.ts, stepRunInfo.ts.
4. StepRunPanel.tsx and useStepOutputs.ts.
5. names.ts, references.ts, salvage.ts.
6. messages/index.ts.

Most attention: Flow.tsx (pointer drag threshold and event order), the cache rules in outputCache.ts (the browser sends a run name and never a value), and salvage.ts offsets.

Tests

• StepSideDrawer, WorkflowPanel, DocumentSwitcher, DAGAttributes, dialog-layer.
• useStepOutputs, JsonValue, inputProvenance, outputCache, stepRunInfo.
• names, references.

Screenshots

The engine view is used by the workflow page in a later PR. The shots show its result in the final UI.