Subagents now discover and read .agents/skills/ directory: - Workflows: execute-phase, plan-phase, quick - Agents: gsd-executor, gsd-planner, gsd-phase-researcher, gsd-plan-checker Agents read SKILL.md (lightweight index) and load rules/*.md as needed, avoiding full AGENTS.md files (100KB+ context cost). Fixes: #672 Co-Authored-By: Claude <noreply@anthropic.com>