Initial scaffold: spec, architecture playbook, and M0 skeleton

CLAUDE.md

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+# Claude Context — Astrolabe
+
+See @AGENTS.md for project overview, architecture rules, and the AI developer protocol.
+
+## Documentation Index
+
+- **[SOUL.md](SOUL.md)** — project philosophy and identity. _Read first._
+- **[docs/spec/](docs/spec/)** — authoritative behavioral specification (sections 00–10):
+  the **what**. This is the contract; implement to it.
+- **[docs/architecture/](docs/architecture/00-overview.md)** — architecture playbook
+  (00–08): the **how** (state, persistence, modals, routing, rendering, inference,
+  relationships, vega-editor techniques). Self-contained — no external repo needed.
+- **[docs/IMPLEMENTATION-PLAN.md](docs/IMPLEMENTATION-PLAN.md)** — incremental milestone
+  plan (M0–M6), MVP boundary, per-milestone tests + manual checks, and an architecture
+  reference index.
+- **[AGENTS.md](AGENTS.md)** — onboarding, stack, directory map, scripts, conventions.
+
+## Quick Orientation
+
+- Astrolabe is a **spec-driven rebuild** — the behavior is fixed in `docs/spec/`; the
+  architecture is adapted from Syto. Implement to the spec; don't port legacy code.
+- **`src/core/` is portable and tested hardest.** Browser specifics live in
+  `src/app/infrastructure/`. UI is React + Zustand.
+- **Editor is Monaco**, charts render via **vega-embed**, storage is **IndexedDB**.
+- Work milestone by milestone (see the plan): core-first, then UI, then tests, then a
+  manual smoke check against the spec's acceptance points.
+
+## Conventions
+
+- No git actions unless explicitly invited.
+- Run `npm run typecheck` and `npm test` after changes.
+- Single-line commit subjects; no Co-Authored-By trailers.