docs(work): scaffold work-system-v1 epic + story

docs/work/work-system-v1/01-state-builder-and-cli/_story.md

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+---
+id: 01-state-builder-and-cli
+epic: work-system-v1
+title: State builder + pnpm work CLI
+type: technical-story
+status: in-progress
+feature: scripts
+depends-on: []
+blocks: []
+---
+
+## Goal
+`pnpm work status` shows the current epic/story state across `docs/work/`.
+`pnpm work next` prints the next unblocked story. `pnpm work rebuild-state`
+regenerates `_state.json` from markdown.
+
+## In scope
+- `scripts/work/state-builder.mjs` — pure function, fully tested
+- `scripts/work/cli.mjs` — argument dispatch + I/O wrapping the builder
+- `docs/work/_state.json` — initial committed snapshot
+- pnpm work script entry
+
+## Out of scope
+- Per-task state (tasks are markdown checkboxes, not separate entries)
+- Orchestrator dispatch logic
+- Dependency-graph analysis
+
+## Tasks
+- [ ] Epic + story scaffold
+- [ ] state-builder.mjs + tests
+- [ ] cli.mjs + tests
+- [ ] _state.json initial commit + pnpm work script entry
+- [ ] Final verification + closeout