Agent Skills: accelint-onboard-agents

Onboard a repository to agent-driven development by creating or refreshing a complete AGENTS.md or CLAUDE.md through behavior-focused discovery, structured interviewing, drift-aware updates, conflict-aware synthesis, proportional updates, and preview-before-write review. Use when the user wants to create, replace, refresh, import, restructure, append to, dry-run, or review AGENTS.md or CLAUDE.md guidance, mentions agent behavior, instructions, guardrails, workflow, Claude Code conventions, package-level agent files, or monorepo inheritance, or asks how to tell an AI coding agent how to behave in a project. Also use it when the user wants behavior rules kept separate from `openspec/config.yml` or `openspec/config.yaml` project DNA. Do not use it for OpenSpec config onboarding, architecture docs, or one-line AGENTS.md or CLAUDE.md edits that do not require discovery, synthesis, or section-level review.