refactor(docs): split CLAUDE.md into scoped rules files under .claude/rules/

Each concern (identity, session protocol, workplan convention, stack,
architecture, repo boundary) now lives in its own file with a single
responsibility. CLAUDE.md becomes a thin @-import integrator. Removes
Ralph Loop duplication — global ~/.claude/CLAUDE.md remains authoritative.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/rules/stack-and-commands.md

@@ -0,0 +1,46 @@
+## What this repo builds
+
+A CLI tool (`bridge`) that manages named SSH reverse tunnels:
+
+```
+bridge up [TUNNEL]      # start tunnel(s)
+bridge down [TUNNEL]    # stop tunnel(s)
+bridge restart [TUNNEL] # restart tunnel(s)
+bridge status           # show all tunnels: state, uptime, last health check
+bridge logs [TUNNEL]    # tail reconnect log
+```
+
+Config file: `~/.config/bridge/tunnels.yaml`
+
+Each tunnel:
+- Named (e.g. `state-hub-coulombcore`)
+- Reverse SSH port-forward: `ssh -R remote_port:127.0.0.1:local_port host`
+- Auto-reconnects on drop (backoff loop)
+- Optional HTTP health check to confirm the forwarded service is reachable
+
+PRD: `workplans/BRIDGE-WP-0001-initial-implementation.md`
+
+## Stack
+
+- **Language:** Python 3.11+
+- **CLI framework:** Typer
+- **Dependencies:** typer, pyyaml, httpx
+- **Packaging:** `uv tool install` (single command install, no venv activation)
+- **No system daemons** — process management is internal, PID tracked in
+  `~/.local/state/bridge/`
+
+## Dev Commands
+
+```bash
+# Install locally for development
+uv tool install -e .
+
+# Run tests
+uv run pytest
+
+# Run a single test
+uv run pytest tests/test_tunnel.py::test_name -v
+
+# Lint
+uv run ruff check .
+```