Add harness workflow and Material showcase design system

2026-03-23 17:30:30 +08:00
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+# Execution Plans
+
+Execution plans make non-trivial work resumable and reviewable by both humans and agents.
+
+## Naming
+
+Use `YYYY-MM-DD-short-name.md`.
+
+Examples:
+
+- `2026-03-23-harness-foundation.md`
+- `2026-03-24-date-picker-accessibility.md`
+
+## When To Add One
+
+Create or update a plan when the change:
+
+- spans multiple directories or validation surfaces
+- alters public contracts, release behavior, or build pipelines
+- is large enough that another person or agent may continue it later
+
+## Status Model
+
+Prefer one of these status values near the top of the plan:
+
+- `proposed`
+- `in-progress`
+- `blocked`
+- `completed`
+- `abandoned`
+
+## Minimum Contents
+
+Every plan should cover:
+
+- goal
+- scope
+- constraints or non-goals
+- affected surfaces
+- implementation steps
+- validation strategy
+- status log
+
+Start from [TEMPLATE.md](./TEMPLATE.md).