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v0.19.0

feature

Portable AGENTS.md project guidance for Claude Code, OpenCode, Codex, and other compatible coding agents.

Portable agent instructions

New sites now keep their generated project guidance in AGENTS.md, so multiple coding agents can share one canonical instruction file. CLAUDE.md contains only @AGENTS.md for Claude Code compatibility.

Running seite upgrade migrates existing CLAUDE.md guidance without losing custom content. Projects that already have both files keep their Claude-specific instructions while gaining exactly one canonical import.

Instruction migration is atomic, preserves file permissions, rejects invalid paths, and writes the new project version only after every upgrade succeeds. Skill-pack integrations now use the same canonical instructions and clean up legacy managed sections.