Quern REST API reference — the correct HTTP endpoints, methods, and request body schemas for the Quern debug server at localhost:9100. Use this skill whenever writing Python scripts, curl/httpie commands, or any HTTP requests targeting the Quern REST API. Also use when the user asks about quern REST paths, endpoint mappings, or how to call quern from code. The MCP tool names do NOT match REST paths (e.g., type_text → /device/ui/type, not /device/ui/type-text), so this reference is essential to avoid guessing wrong. Trigger on: quern + (python|curl|requests| httpie|script|REST|API|endpoint|path), or when you see localhost:9100 in code being written.
Migrate a Quern app knowledge base from the legacy `identify_by:` schema to the `landmarks:` schema (introduced April 2026 in PR #22). Use this skill whenever `load_landmarks` returns a non-empty `skipped[]` array with `legacy_format` entries, or when the user explicitly asks to migrate / upgrade a knowledge base to landmarks. Categorizes files by translation difficulty, batches the mechanical ones with a single consolidated diff, and defers files that need the live screen for re-authoring. Trigger on: load_landmarks response showing skipped legacy_format files, user mentions "migrate landmarks" / "migrate knowledge base" / "update KB to landmarks" / "upgrade screens to landmarks", or working in a `.quern/ knowledge/` directory whose screens use `identify_by:` not `landmarks:`.