Add fourteen skills from Dimillian/Skills, integrate the merged Snowflake and WordPress updates into the maintainer sync, and refresh registry metadata, attributions, walkthrough notes, and the 8.9.0 release notes while keeping validation warnings within budget.
Refresh maintainer-owned artifacts after the PR merge batch, convert the\nJetski loader example to a directly importable Node ESM module, and add\nthe 8.7.0 changelog entry before release preparation.\n\nRefs #382\nRefs #388
Align public docs and maintainer guidance with the current 1,304-skill catalog state and v8.4.0 release copy.
Refresh README credits for newly imported external sources, update user-facing count references, and document the post-release docs realignment in the changelog and walkthrough.
