Docs: landing scope memo, deployment record, VS Code extension exploration

docs/deployment.md

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+# Deployment & Distribution
+
+Operational facts that live nowhere in the code.
+
+## Hosting
+
+- **astrolabe-viz.com** runs on **Cloudflare Pages**, project `astrolabe-viz`,
+  Git-connected to the private GitHub repo `olehomelchenko/astrolabe`.
+- **Push to `main` auto-builds and deploys** (`npm run build`; the post-build
+  `check-light-entries` gate runs as part of it). There are no GitHub Actions.
+- Live since 2026-06-20.
+- **No analytics.** The app ships no beacon or tracking of any kind; Cloudflare keeps
+  standard aggregate access logs as any host does. The About modal's privacy copy states
+  exactly this — keep them in agreement.
+
+## Distribution posture
+
+- **Free to use; the code is private.** Astrolabe is not open source. User-facing copy
+  (landing, About, learn) must never claim or imply otherwise — the open thing is the
+  _format_ (Vega-Lite JSON), and copy attributes openness to it deliberately.
+- **Feedback channel** is the branded address `feedback@astrolabe-viz.com`
+  (`src/app/feedback.ts`), not a public issue tracker.
+- **Release cadence**: unreleased pre-1.0; the first public release is `1.0.0`, cut on
+  the maintainer's signal (see `docs/IMPLEMENTATION-PLAN.md` and the `/release` skill).