Add README documentation

Documents service purpose, endpoints, cron format, and configuration.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# Schedule Service
+
+Task scheduler for Egregore.
+
+## Purpose
+
+Cron-like scheduler that triggers AI tasks on a schedule. Wakes the reason service at configured times to perform automated work.
+
+## Endpoints
+
+| Endpoint | Method | Description |
+|----------|--------|-------------|
+| `/schedules` | GET/POST | List or create schedules |
+| `/schedules/{id}` | GET/PATCH/DELETE | Manage a schedule |
+| `/schedules/{id}/run` | POST | Manually trigger a schedule |
+| `/schedules/{id}/history` | GET | View execution history |
+| `/health` | GET | Health check |
+
+## Configuration
+
+Schedules stored in `~/data/schedules/`.
+
+Each schedule has:
+- `name` - Descriptive name
+- `cron` - Cron expression (e.g., `0 9 * * *`)
+- `instruction` - What to tell the reason service
+- `enabled` - Active flag
+
+## Running
+
+```bash
+# Activate venv
+source ~/.venv/bin/activate
+
+# Run directly
+python main.py
+
+# Or via systemd
+sudo systemctl start schedule
+sudo systemctl status schedule
+```
+
+## Cron Format
+
+Standard 5-field cron: `minute hour day month weekday`
+
+Examples:
+- `0 9 * * *` - Daily at 9am
+- `*/15 * * * *` - Every 15 minutes
+- `0 0 * * 0` - Weekly on Sunday midnight
+
+## Dependencies
+
+- FastAPI
+- APScheduler (cron scheduling)
+- httpx (to call reason service)