ledmapper

Persistent agent dev-loop for UI work — keep the dev server and browser session alive across edits, wait on an explicit HMR-ready signal instead of sleeping, and query only what changed. Use when making UI/behavior changes to any tool (demo, moviemaker, movieplayer, shapeeditor, screenmap) and you need to observe the running app, not just pass unit tests.

How to debug ledmapper — event log, per-tool debug state, copy-diagnostics payloads, rendering watchdogs, the ?debug panel, and test-side tooling. Use when diagnosing bugs, reading a user's diagnostics paste, investigating a black canvas or a broken recording, or writing debug instrumentation.