Add CLAUDE.md guide for Claude Code sessions

CLAUDE.md

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+# CLAUDE.md
+
+Guide for Claude Code working in **nerve**. Keep it short — depth lives in `docs/`.
+
+## Overview
+
+Nerve is a self-hosted, single-process personal AI assistant runtime: one Python
+process (FastAPI + asyncio) wrapping the **Claude Agent SDK**, backed by SQLite +
+a markdown file store. Runs in two modes — **personal** (your assistant) and
+**worker** (headless agent). Python backend in `nerve/`, React + Vite + TS web UI
+in `web/`. See `docs/architecture.md`.
+
+## Commands
+
+Backend uses **uv** (no `uv.lock`; CI keys its cache on `pyproject.toml`).
+
+```bash
+# Setup
+uv venv --python 3.13 && source .venv/bin/activate && uv pip install -e ".[test]"
+
+# Tests (CI runs the second form)
+pytest tests/ -v
+.venv/bin/pytest tests/ -v
+
+# Run app
+nerve init                 # first-time setup
+nerve start -f             # foreground
+nerve stop|restart|status|doctor   # lifecycle (see nerve/cli.py)
+
+# Web UI (from web/)
+cd web && npm ci
+npm run build              # tsc -b && vite build
+npm run dev                # vite dev server
+npm run lint               # eslint
+```
+
+CI (`.github/workflows/ci.yml`): backend tests on Python 3.13 + frontend Vite
+build. No Python linter configured.
+
+## Layout
+
+Backend subsystems under `nerve/`:
+
+| Path | Role |
+|------|------|
+| `gateway/` | FastAPI — REST, WebSocket, static UI serving |
+| `agent/` | Claude SDK engine: sessions, interactive tool handler, diff hooks |
+| `channels/` | Telegram + web channel adapters |
+| `sources/` | External content ingestion (cursor-based) |
+| `memory/` | L1 `MEMORY.md` + L2 memU bridge |
+| `tasks/` · `cron/` | Background tasks + scheduled jobs |
+| `skills/` · `mcp_server/` | Agent skills + nerve's own MCP server |
+| `proxy/` | CLIProxyAPI OAuth |
+| `notifications/` · `observability/` · `sync/` · `external_agents/` · `houseofagents/` | named per role |
+| `db/` | `Database` composed from domain mixins (`sessions.py`, `tasks.py`, …) + `migrations/` |
+| `cli.py` · `config.py` · `_env.py` · `bootstrap.py` | entry points + config |
+
+`web/src/` = React UI · `tests/` = pytest suite · `docs/` = deep docs.
+
+## Conventions & gotchas
+
+- **Python 3.13 is the real floor** despite `requires-python>=3.12` — `memu-py==1.4.0`
+  needs 3.13. That pin is intentional: nerve monkey-patches memU internals
+  (`memu_bridge._patch_sqlite_bugs`). Don't bump casually.
+- **`import nerve._env` must run before numpy loads** — it caps BLAS threads to
+  avoid fork/atfork deadlocks. Kept as the first import in `nerve/cli.py`.
+- **DB migrations**: add `nerve/db/migrations/vNNN_description.py` exporting
+  `async def up(db)`. `SCHEMA_VERSION` is derived from the highest file number
+  (`nerve/db/base.py`).
+- **Config**: `config.example.yaml` is the reference; the live `config.yaml`
+  deep-merges with gitignored `config.local.yaml` for secrets.
+- Async-first; tests use **pytest-asyncio** (`tests/conftest.py`).
+- Never commit `.env`, secrets, or `config.local.yaml`.
+
+## Docs
+
+`architecture` · `setup` · `config` · `api` · `sdk-sessions` · `memory` ·
+`tasks` · `cron` · `plans` · `sources` · `web-ui` · `worker-guide` ·
+`observability` · `migration` · `external-mcp` · `codex-sync` (all under `docs/`).