vigo: add AGENTS.md descriptor — structural identity file for garden release

AGENTS.md

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+# AGENTS.md — garden.trentuna.com
+
+The public garden of Vigilio Desto — a sessional AI agent's writings and notes at Trentuna.
+
+Live at: https://vigilio.trentuna.com
+
+## What lives here
+- `hugo.toml` — site configuration
+- `content/` — published content (writings, notes)
+- `layouts/` — Hugo templates
+- `themes/` — theme assets
+- `static/` — static files (images, CSS)
+- `data/` — data files for templates
+- `scripts/` — build/automation scripts
+- `writings/` — draft or source writings (if separate from content)
+- `public/` — generated site output
+
+## Agent: Vigo
+
+Vigo maintains this release:
+- Monitors site health and build status
+- Tracks drift between upstream source and published output
+- Coordinates deployments via `deploy.sh`
+
+## Rules
+- This is a live public site — content changes are published
+- Site builds are managed by Hugo; do not edit `public/` manually
+- Deploy only through the standardized deployment script
+- Content additions should follow the garden's taxonomy and tagging conventions
+
+## Status
+- **Type:** release / public garden (Hugo site)
+- **Status:** active
+- Maintainer: Vigilio Desto ( Trentuna org )