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

AGENTS.md

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+# AGENTS.md — asw
+
+Agentic Semantic Web — CSS framework for agent-generated web content. Semantic HTML + data-attributes. Zero classes.
+
+## What lives here
+- `README.md` — project overview
+- `src/` — source stylesheets
+- `dist/` — built distribution files
+- `docs/` — documentation
+- `examples/` — usage examples
+- `packs/` — style packs
+- `package.json` / `package-lock.json` — Node.js dependencies
+- `postcss.config.js` — build configuration
+- `vendor/` — vendored dependencies
+- `deploy.sh` — deployment script
+- `openspec/` — OpenSpec specifications
+
+## Agent: Vigo
+
+Vigo monitors this release:
+- Tracks build health and deployment status
+- Notes structural drift (e.g., stray build artifacts)
+- No direct modification — this is an active development study promoted to release
+
+## Rules
+- This is an active development release (unstable but functional)
+- Changes originate upstream in the source study repo; this release mirrors the published state
+- Build artifacts in `dist/` and `public/` are generated — do not edit manually
+
+## Status
+- **Type:** agent-system / CSS framework
+- **Status:** unstable but promising (active development)
+- Origin: projects/asw study