docs(runtimes): runtime changelog + periodic update tooling

[HayesGordon]

Adds a runtime changelog at /runtimes/changelog and the tooling to produce it periodically - covering all 8 Rive runtimes (Apple, Android, Web, React, React Native, Flutter, Unity, Unreal) plus a derived Core runtime section for shared C++ changes. As a bonus, it keeps the docs' install-version snippets from going stale.

How it works

The design splits deterministic facts from one AI editorial step:

Piece	Role	AI?
scripts/runtime-changelog/collect.mjs	Reads package registries + GitHub, decides what shipped, owns every version/date/URL	No
.claude/skills/runtime-announcement	Turns collected notes into changelog prose; reviewed every run	Yes (prose only)
scripts/runtime-changelog/digest.mjs	Reassembles the committed changelog into a copy-paste community post	No
scripts/runtime-changelog/state.json	Committed record of last-announced version per runtime - the boundary for the next entry	No

Versions, dates, and links are never AI-authored - the agent only writes wording. --advance-state also syncs docs.json version variables (versionApple, versionWeb, …) to each runtime's latest, so wired install snippets never rot.

Usage

One command in Claude Code: /runtime-announcement. It collects releases → drafts the entry → shows you the entry + a preview of the community post → you approve → it records state and bumps docs versions → you review git diff and commit. The community post is saved to generated/community-post.md (git-ignored) for pasting into Discord/forum. Full runbook in scripts/runtime-changelog/README.md.

What's in this PR

• Changelog page + baseline entry covering all 8 runtimes
• Tooling: collect.mjs, digest.mjs, state.json, README.md, the skill
• docs.json: nav entry + auto-synced runtime version variables
• 8 runtime docs pages: install snippets wired to those variables, replacing stale hardcoded versions (e.g. iOS 6.13.0→current, RN default block 6.12.0→current)

Everything is local and human-reviewed - no commits, pushes, or PRs happen automatically.

Still on the table

• Pick a changelog shape. Two pages are included for comparison: changelog.mdx (grouped by date) and changelog-per-runtime.mdx (grouped by runtime, filterable). Delete the loser + its temp docs.json nav entry before merge.
• CLAUDE.md still says mintlify - the CLI is now mint. Separate cleanup.
• No automation yet - scheduled runs / auto-PRs are intentionally out of scope; revisit once the manual flow is proven.
• Core links the repo, not a version - rive-runtime has no releases yet. When it does, Core can link a specific version.
• RN default-version block tracks "latest" - accurate today (RN bundles latest), with prose pointing at package.json if it ever lags.

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Project	Status	Preview	Updated (UTC)
rive	🟢 Ready	View Preview	Jul 17, 2026, 5:33 PM

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