docs(plugins): add Claude and Codex plugin guides

Document the new Claude Code and Codex plugin distributions and explain how root plugins, bundle plugins, and plugin-safe filtering relate to the full library install.\n\nSync the catalog, plugin compatibility artifacts, and generated plugin-safe subsets so main stays consistent before the v9.0.0 release flow.

CHANGELOG.md

@@ -9,6 +9,44 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [9.0.0] - 2026-03-27 - "Claude Code and Codex Plugin Release"
+
+> Full release for the installable skill library, now with first-class plugin distributions for Claude Code and Codex plus the normal GitHub Release publication flow.
+
+Start here:
+
+- Install: `npx antigravity-awesome-skills`
+- Plugin explainer: [docs/users/plugins.md](https://github.com/sickn33/antigravity-awesome-skills/blob/main/docs/users/plugins.md)
+- Choose your tool: [README -> Choose Your Tool](https://github.com/sickn33/antigravity-awesome-skills#choose-your-tool)
+- Bundles: [docs/users/bundles.md](https://github.com/sickn33/antigravity-awesome-skills/blob/main/docs/users/bundles.md)
+- Workflows: [docs/users/workflows.md](https://github.com/sickn33/antigravity-awesome-skills/blob/main/docs/users/workflows.md)
+
+This release makes the new plugin distribution model a user-facing feature. Claude Code now has a formal root marketplace plugin plus generated bundle plugins, and Codex now ships the equivalent repo-local root plugin plus generated bundle plugins. The release also consolidates plugin documentation into a canonical user guide, aligns onboarding docs around the difference between the full repository and the plugin-safe subset, and packages the latest merge batch on `main`.
+
+## New
+
+- **Claude Code plugin distribution** - formalized the root `.claude-plugin` marketplace entry plus generated bundle plugins as a first-class install path.
+- **Codex plugin distribution** - formalized the root Codex plugin metadata in `.agents/plugins/marketplace.json` and `plugins/antigravity-awesome-skills/.codex-plugin/plugin.json`, alongside generated bundle plugins.
+- **Canonical plugin documentation** - added `docs/users/plugins.md` to explain plugin-safe filtering, root plugin vs bundle plugins, and when to prefer plugins over the full library install.
+- **akf-trust-metadata** - merged PR #406, adding the new `akf-trust-metadata` skill to the repository.
+
+## Improvements
+
+- **Onboarding alignment** - updated `README.md`, `docs/users/getting-started.md`, `docs/users/faq.md`, `docs/users/claude-code-skills.md`, `docs/users/codex-cli-skills.md`, `docs/users/bundles.md`, and `docs/users/usage.md` so the plugin story is explained consistently.
+- **Community discovery** - merged PR #407 to add the CoinPaprika & DexPaprika listing to the community-contributed section of the README.
+- **Maintainer release batch** - merged both open PRs through the documented GitHub squash flow, then packaged the resulting `main` branch as a full release instead of a tag-only cut.
+
+## Who should care
+
+- **Claude Code users** now have a cleaner choice between full-library install, root marketplace plugin, and smaller bundle plugins.
+- **Codex users** now get the same plugin distribution model instead of relying only on direct `.codex/skills/` installs.
+- **Maintainers and team leads** can onboard people with plugin-safe starter surfaces while keeping the full repository as the broader source of truth.
+
+## Credits
+
+- **[@CryptoDoppio](https://github.com/CryptoDoppio)** for the new `akf-trust-metadata` skill in PR #406
+- **[@coinpaprika](https://github.com/coinpaprika)** for adding the CoinPaprika & DexPaprika community listing in PR #407
+
 ## [8.10.0] - 2026-03-26 - "Discovery Boost for Social, MCP, and Ops"
 
 > Installable skill library update for Claude Code, Cursor, Codex CLI, Gemini CLI, Antigravity, Windsurf, Cline, and related AI coding assistants.