Release v0.4.0 — EOV Integration

Add Ecological Outcome Verification (EOV) as a first-class domain:
- 5 issue templates (site assessment, soil sample, water test, photo point, action)
- Copilot enrichment instructions with score mapping and trend analysis
- 2 workflows (enrichment trigger, quarterly seasonal reminders)
- 4 runbooks for non-technical users
- eov/ reference directory (monitoring plan, site map, baseline, goals)
- 8 new labels, README EOV section with Savory Institute links
- Updated user guide, copilot instructions, weekly reminder