v2.3.0 — 12 new tools (170+ total)

New catalog tools: github_repo_releases, github_repo_issues (PR-filtered), github_repo_pulls, github_user_repositories, github_user_social_accounts, github_repo_contributors, github_repo_subscribers, github_repo_collaborators (permission-aware), github_repo_git_refs, github_repo_punch_card, github_repo_security_advisories, github_search_repositories.

Verification: 35 unit tests passed; every new tool passed a real-network smoke against the public GitHub API; CI installs the bundle into a fresh dsh profile and boots it.