[Feat] Add GitHub daily management skills

[roomote-roomote]

Created by Roomote. Follow up by mentioning @roomote-roomote, in the web UI, or in Discord.

Closes #865

What changed

• Added the packaged github-management skill for label, milestone, and GitHub Projects V2 Status operations using the task's scoped GitHub App credential.
• Creates and additive label application run directly; edits, label replacement, milestone assignment or clearing, project Status moves, and deletion require preflight and explicit confirmation. Every write is read back and reported.
• Registered $github-management as an authoritative packaged invocation and added coverage for the skill contract and invocation routing.
• Added the Organization projects permission to the generated GitHub App manifest and documented re-approval requirements and daily management behavior.
• Kept native saved views explicitly capability-gated rather than using a linked user's broader OAuth token.

Why this change was made

Routine GitHub management should be available from Roomote tasks without widening the provider-neutral MCP write surface or bypassing the existing scoped credential model. Confirmation is reserved for destructive changes so ordinary additions remain fast.

Impact

Tasks can now manage repository labels and milestones and eligible Projects V2 Status values. Additive actions do not interrupt the task, while changes to existing shared state retain a clear confirmation and read-back trail. Native saved views remain unavailable until GitHub API and installation-token compatibility are verified.

The focused tests, type checks, documentation validation, and pre-push checks pass. The standalone cloud-agents lint command still reports an unrelated existing unused ESLint-disable warning in packages/cloud-agents/src/__tests__/utils.test.ts.

[roomote-roomote]

No code issues found. See task

_{Reviewed 9aabda0}