Updated Release-Readiness.md for post-alpha.2 state.

[github-actions]

All changes are complete. Here's a summary of what was updated in docs/Release-Readiness.md:

1. Status section — Updated from "first public alpha" to reflect three published alpha versions (alpha.0, alpha.1, alpha.2); clarified 5 packages under scope with 4 published; removed stale GitHub Release link.
2. Package audit version fields — Updated Current version to actual prerelease versions: core → 0.1.0-alpha.1, dom → 0.1.0-alpha.2, router → 0.1.0-alpha.1, testing → 0.1.0-alpha.1; server stays at 0.1.0 (private).
3. Package naming — Server description updated from "private workspace package for first alpha" to "not published".
4. Server publish note — Updated from "private for first alpha" to "stays private".
5. Publish cadence — Changed from "Start with an alpha release" to "Currently publishing alpha releases (alpha.0 through alpha.2 so far)".
6. Checklist heading — Renamed from "First alpha release checklist" to "Alpha release checklist"; added checked item for subsequent alpha releases.
7. Post-release verification — Updated published versions to latest alpha; generalized dist-tag descriptions.

Validation: pnpm lint (typecheck) passed, pnpm changeset status passed. Only docs/Release-Readiness.md was modified.

Closes #71

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