Cursor prompt: Add AI action lifecycle state machine (stub)

Prerequisites

Read:

• [ ] [ONTOUI.md](../AI_ORCHESTRATION.md`
• [ ] 0006-ai-preview-before-apply.md

Non-goals

• Real LLM providers
• Network calls

Current state

• No AI state in store today

Tasks

1. Add ai slice to WorkspaceStore with lifecycle enum (Idle, ProposalGenerated, PreviewShown, Applied)
2. Add actions: proposePatch, showPreview, approve, reject (no network)
3. Gate approve() to require PreviewShown state
4. Add aiStore.test.ts for lifecycle transitions

Acceptance criteria

• [ ] Cannot approve from Idle
• [ ] approve only from PreviewShown
• [ ] Tests pass

Tests

• cd extension/webview-ui && npm test

Do not

• Do not add API keys or fetch calls

References

• Cursor prompts index