Initial supervisor skill with auto-discovery

SKILL.md

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+---
+name: supervisor
+description: Process manager for running multiple skills concurrently
+metadata:
+  version: "1.0.0"
+  vibestack:
+    main: true
+---
+
+# Supervisor Skill
+
+Runs multiple skills as managed processes using [supervisord](http://supervisord.org/).
+
+## Features
+
+- Auto-discovers skills with `run.sh` scripts
+- Manages process lifecycle (start, stop, restart)
+- Log aggregation
+- Process health monitoring
+- Web UI for process management (optional)
+
+## Auto-Discovery
+
+On startup, supervisor scans `/skills/*/scripts/run.sh` and creates a program entry for each skill that has a `run.sh` script.
+
+Skills can opt-out by setting `SUPERVISOR_SKIP=true` in their environment or by not having a `run.sh` script.
+
+## Configuration
+
+### Environment Variables
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `SUPERVISOR_HTTP_PORT` | Web UI port (0 = disabled) | `9001` |
+| `SUPERVISOR_USER` | Web UI username | `admin` |
+| `SUPERVISOR_PASSWORD` | Web UI password | `admin` |
+| `SUPERVISOR_LOG_DIR` | Log directory | `/var/log/supervisor` |
+
+### Per-Skill Configuration
+
+Skills can provide a `.supervisor.conf` file in their directory to customize their process:
+
+```ini
+[program:my-skill]
+priority=100
+autostart=true
+autorestart=true
+startsecs=5
+```
+
+## Usage
+
+Supervisor is typically the `main: true` skill that orchestrates other skills:
+
+```bash
+SKILL_URLS="https://git.../supervisor https://git.../caddy https://git.../ttyd"
+MAIN_SKILL="supervisor"
+```
+
+## Web UI
+
+Access at `http://localhost:9001` to:
+- View process status
+- Start/stop/restart processes
+- View logs