feat(canvas): phase 5 — run history, debug panel, error UX#15

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prosdev wants to merge 12 commits intomainfrom

plan/canvas-phase-5

Commits on Mar 21, 2026

docs: phase 4 implementation log + phase 5 planning

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docs: update gw-frontend skill + orchestration memory for phase 4

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feat(canvas): add activity bar and panel layout system

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feat(canvas): add run history panel with API client and store

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feat(canvas): add debug panel with state inspector and JSON tree

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feat(canvas): add validation error dialog and server-side validation

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feat(canvas): add schema viewer panel with validation badge and export

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fix(canvas): address code review findings for layer rule violations

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fix(canvas): eliminate double request, add body to ApiError

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fix(canvas): address user journey review findings

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refactor(canvas): extract panel state from context into panelSlice

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fix(canvas): reset history on graph nav, add delete confirmation

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