Add repo conventions and cron documentation

cron/capmetro-monitor.md

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+# CapMetro Monitor
+
+## Purpose
+
+Watch for CapMetro service changes relevant to Ben's commute, especially Route 5 and MetroRail-related monitoring assets.
+
+## Entrypoints
+
+- Skill: `skills/capmetro-monitor/`
+- Primary monitor: `skills/capmetro-monitor/scripts/monitor.sh`
+- Change check: `skills/capmetro-monitor/scripts/check-changes.sh`
+- Route status helper: `skills/capmetro-monitor/scripts/route5-status.sh`
+- Additional watch scripts:
+  - `skills/capmetro-monitor/scripts/watch-departure.sh`
+  - `skills/capmetro-monitor/scripts/watch-departure-v2.sh`
+  - `skills/capmetro-monitor/scripts/monitor-route5.js`
+
+## Schedule
+
+- Recurring
+- Exact active runtime schedule should be recorded here when finalized
+
+## Expected behavior
+
+- Checks for service changes and commute-relevant updates
+- Translates transit-operator language into plain English summaries
+- Supports route/status-specific helper workflows
+
+## Notes
+
+Prefer GTFS-driven or documented skill behavior over ad hoc scraping where possible. If the operational entrypoint changes, update this doc.