Add agentic workflow definitions for repository automation

[Copilot]

Implements AI-powered automation workflows using GitHub's experimental gh-aw tool. Provides natural language workflow definitions for common maintenance tasks—particularly safe Dependabot auto-merge.

Workflows Added

Source definitions only (.md format). Requires gh aw compile to generate executable .lock.yml files.

• dependabot-auto-merge.md - Auto-approves patch/minor npm updates after CI passes. Requires manual review for major versions.
• issue-triage.md - Labels and analyzes new issues with debugging tips, duplicate detection, stack-aware context.
• ci-doctor.md - Investigates failed CI runs, analyzes logs, identifies root causes (Astro build, dependencies, deployment).
• pr-description-enhancer.md - Adds structured context to PRs: dependency changelogs, content metadata, review checklists.

Design Decisions

Why not include .lock.yml files?
Auto-generated, require AI model configuration and API keys. Users opt-in by compiling locally.

Safety constraints:

• permissions: read-all by default
• Explicit safe-outputs whitelist (add-comment, add-labels, approve-pr, enable-auto-merge)
• stop-after: +6mo on all workflows (time-limited experimentation)
• Conservative: defers to humans for critical actions

Setup Required

gh extension install githubnext/gh-aw
gh aw compile
# Configure AI model, add secrets, commit .lock.yml files

See .github/workflows/AGENTIC_WORKFLOWS.md for complete documentation.

Repository Updates

• Updated README.md with automation section
• Updated dependabot.yml with workflow compatibility notes
• Added 25KB documentation (setup, usage, troubleshooting, security)

Original prompt

See which agentic workflows I should add, especially anything to help auto merge safe Dependabot updates. See https://github.com/githubnext/gh-aw for more information

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.