docs: platform fleet-library onboarding and the prebuilt fleets

[indykish]

Documents the operator surface shipped in agentsfleet/agentsfleet#516.

• fleets/library.mdx — how a platform operator onboards an entry from the dashboard (Fleet libraries, under Configuration, gated on platform-library:write), and the four prebuilt fleets with the secrets each needs: github-pr-reviewer, platform-ops, zoho-sprint-daily-summarizer, zoho-recruiter-daily-summarizer.
• The identifier rule — agentsfleet takes the library id from the name in SKILL.md, not from the repository path. When the repository name, the SKILL.md name, and the TRIGGER.md name disagree, the bundle is rejected or filed under an identifier the author did not expect. This is the bug that made platform-ops undeployable, so it is now stated on both the library and authoring pages.
• changelog.mdx — a new <Update> for Jul 12, 2026.

A prebuilt fleet appears in a workspace's library only after an operator onboards it; until then the catalog knows its name but holds no bundle. That is now said plainly, because the empty gallery was otherwise unexplainable.

🤖 Generated with Claude Code

Greptile Summary

This PR documents platform fleet-library onboarding and the available prebuilt fleets. The main changes are:

• Adds the platform library scope to the API reference.
• Explains dashboard onboarding and catalog availability.
• Lists four prebuilt fleets and their required secrets.
• Clarifies how bundle names determine library identifiers.
• Adds the release details to the changelog.

Confidence Score: 5/5

This looks safe to merge.

• The scope reference now includes the permission required by the onboarding documentation.
• No blocking issues were found in the updated documentation.

Important Files Changed

Filename	Overview
api-reference/scopes.mdx	Documents the platform library write scope and operator wildcard.
changelog.mdx	Adds the release entry for platform onboarding and prebuilt fleets.
fleets/authoring.mdx	Clarifies that repository and bundle names should match.
fleets/library.mdx	Documents onboarding, authorization, identifiers, prebuilt fleets, and gallery availability.

_{Reviews (2): Last reviewed commit: "docs: document platform library scope" | Re-trigger Greptile}