docs: scaffold agent instruction tree

Add AGENTS.md, CLAUDE.md, and the agents-docs/ tree (workflow, lessons,
engineering standards, context map, ADR seed, feature template) plus a
domain-bearing CONTEXT.md for each of the six subdomains: toju-app,
electron, server, e2e, website, docs-site.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs-site/CONTEXT.md

@@ -0,0 +1,44 @@
+# Application Documentation (docs-site)
+
+Owns the Docusaurus-based application and plugin-author documentation. The build output (`docs-site/build/`) is bundled into the Electron app and served by the Local API server at runtime, so documentation is available offline inside the desktop client.
+
+> **Format reference:**
+> - **Vocabulary** — bold term, one-sentence definition, aliases to avoid.
+> - **Relationships** — bullets with bold terms and cardinality.
+> - **Boundaries / IO** — what this subdomain exposes and consumes.
+> - **Invariants** — rules that always hold.
+> - **Flagged ambiguities** — terms in dispute with proposed resolutions.
+>
+> See `agents-docs/AGENTS_CONTEXT.md` for the contract. Update in the same turn a trigger fires (see `agents-docs/AGENT_WORKFLOW.md` § CONTEXT.md upkeep).
+
+## Vocabulary
+
+| Term | Definition | Aliases to avoid |
+|------|------------|------------------|
+| **App docs** | End-user-facing documentation for the MetoYou desktop client. | "manual" |
+| **Plugin docs** | Developer-facing reference for the plugin runtime — manifest format, lifecycle hooks, host APIs. Authoritative source for the plugin contract surface. | "API docs" |
+| **Local API server** | The Electron in-process HTTP server that mounts `docs-site/build/` so the renderer can browse docs offline. Defined under `electron/api/`. | "embedded server" |
+
+## Relationships
+
+- **Plugin docs** describe contracts implemented in `toju-app/src/app/shared-kernel/plugin-system.contracts.ts` (renderer side) and `electron/plugin-library.ts` (host side) — keep them in lockstep with code changes.
+- The **build output** at `docs-site/build/` is a deploy artifact for the **electron** Local API server; `npm run build:all` requires `npm run build:docs` to have run.
+- The site is also deployed publicly via `.gitea/workflows/deploy-web-apps.yml` for browsing outside the app.
+
+## Boundaries / IO
+
+- **Exposes:** static Docusaurus bundle at `docs-site/build/`, mounted by Electron's Local API server and also deployed as a public static site.
+- **Consumes:** Markdown sources under `docs-site/docs/`, plus any code-derived references (e.g. OpenAPI documents from `electron/api/openapi.ts`).
+
+## Invariants
+
+- Plugin-contract documentation must match the code; if the manifest schema or lifecycle changes, **plugin docs** and `agents-docs/features/<plugin-doc>.md` both update in the same task.
+- Build artifacts (`docs-site/build/`) are generated, not committed.
+
+## Flagged ambiguities
+
+- _None recorded yet._
+
+---
+
+*Agent-procedural rules (TDD, lint, build) live in `/AGENTS.md`. This file is the bounded-context domain artefact for the documentation site.*