Git Master

Complete Git expertise system for ALL git operations. PROACTIVELY activate for: (1) ANY Git task (basic/advanced/dangerous), (2) Repository management, (3) Branch strategies and workflows, (4) Conflict resolution, (5) History rewriting/recovery, (6) Platform-specific operations (GitHub/Azure DevOps/Bitbucket), (7) Advanced commands (rebase/cherry-pick/filter-repo). Provides: complete Git command reference, safety guardrails for destructive operations, platform best practices, workflow strategies, reflog recovery techniques, and expert guidance for even the most risky operations. Always asks user preference for automatic commits vs manual control.

Git 2.49 specific features and performance improvements. PROACTIVELY activate for: (1) git-backfill command (new in 2.49) for partial clones, (2) path-walk API improvements, (3) zlib-ng integration for faster compression, (4) reftables backend stabilization, (5) revision-walk performance, (6) bundle URI improvements, (7) sparse-checkout enhancements in 2.49, (8) git maintenance defaults in 2.49, (9) credential helper updates. Provides: 2.49 changelog summary, git-backfill recipes, performance comparison vs 2.48, and migration notes for users upgrading from 2.40+.

Git 2.49+ features and modern Git workflows (2025-2026). PROACTIVELY activate for: (1) Git 2.49+ features (reftables, sparse-checkout, partial clone, worktrees), (2) git-backfill for partial clones, (3) reftables migration (file backend to reftable backend), (4) sparse-checkout for monorepos, (5) git worktrees for parallel development, (6) partial clone (--filter=blob:none), (7) commit graph and bitmap optimizations, (8) trunk-based development workflows, (9) Git LFS, (10) modern alternatives to legacy commands. Provides: feature reference, version-detection snippets, sparse-checkout configuration, worktree workflow patterns, and migration guidance from older Git versions.

Git security best practices for 2025-2026 (signed commits, zero-trust, secret scanning). PROACTIVELY activate for: (1) configuring signed commits (GPG, SSH, S/MIME), (2) verifying commit signatures, (3) zero-trust Git workflows, (4) secret scanning (GitHub Advanced Security, gitleaks, trufflehog), (5) preventing secret leaks via pre-commit hooks, (6) protected branches and required reviewers, (7) CODEOWNERS for sensitive paths, (8) Sigstore-style attestations, (9) detecting and remediating leaked credentials, (10) supply-chain security (provenance, SBOM, SLSA). Provides: signed commit setup, secret-scanning integration, pre-commit hook templates, branch protection patterns, and incident-response checklist for credential exposure.

GitHub Actions 2025-2026 features and modernization. PROACTIVELY activate for: (1) 1 vCPU Linux runners (October 2025 public preview), (2) immutable releases for hardened distribution, (3) Node24 migration from Node20, (4) reusable workflows and composite actions, (5) workflow_dispatch with rich inputs, (6) artifact attestations and provenance, (7) ARC (Actions Runner Controller) for self-hosted Kubernetes, (8) larger runners and macOS Apple Silicon runners, (9) deployment environments and protection rules, (10) OIDC federation to AWS/Azure/GCP. Provides: workflow templates, runner-selection matrix, OIDC setup recipes, attestation patterns, and Node24 migration steps.

GitHub AI-powered security and automation features (2025-2026). PROACTIVELY activate for: (1) GitHub Copilot in PRs (Copilot code review, Copilot autofix), (2) GitHub Advanced Security (CodeQL, secret scanning, dependency review), (3) Copilot Workspace, (4) GitHub Models (gh models eval, prompt evaluations), (5) GitHub Copilot CLI 2.x, (6) AI-assisted issue triage, (7) Copilot extensions and skillsets, (8) Copilot Enterprise context (knowledge bases), (9) automated dependency updates (Dependabot AI grouping), (10) Spark for app generation. Provides: feature catalog, Copilot CLI command reference, gh models eval examples, GHAS configuration, and Copilot Workspace usage.