chore: add project docs, glossary, research and opencode/fastcrw skills

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

CONTEXT.md

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+# fastCRW websearch plugin for opencode
+
+An opencode v2 plugin that makes a self-hosted fastCRW server opencode's websearch.
+
+## Language
+
+**Plugin**:
+The opencode v2 module this repo builds and ships.
+_Avoid_: extension, integration
+
+**Search provider**:
+A named websearch backend that opencode can select. This plugin registers one, `fastcrw`, and makes it the only one.
+_Avoid_: engine, backend (a fastCRW server's own search backend is a different thing)
+
+**Endpoint**:
+The base URL of the fastCRW server the plugin talks to. Set by the `baseURL` option or `CRW_API_URL`; defaults to `http://localhost:3000`.
+_Avoid_: host, server URL
+
+**Token**:
+The optional Bearer key sent to the fastCRW server. Set by the `apiKey` option or `CRW_API_KEY`. Absent means no auth header.
+_Avoid_: secret, password
+
+**Plugin options**:
+The values opencode passes to the plugin from `opencode.json`: `baseURL`, `apiKey`, `limit`, `lang`, `tbs`.
+_Avoid_: settings, config (config means `opencode.json` as a whole)