Turn errors now carry a structured {layer, code, retryable} descriptor
(agent/error_surface.py) built from the same classifier the retry loop
uses. The tui_gateway stamps it on terminal error frames, retained
failed-turn snapshots, and resume replay; the Desktop error card renders
the layer title (provider / endpoint / streaming / auth / billing /
gateway / runtime / disk) plus matched actions: Retry, Switch provider,
Open logs, Copy diagnostics.
Older backends that omit the descriptor keep today's behavior (generic
title, string-sniff fallbacks) — the field is advisory on both sides.
52 handlers move into five registrars — git, pet overlay, hud, fs and
terminal. Each takes injected deps (window handles, binary resolvers,
path hardening) following the existing electron/ module pattern rather
than closing over main.ts locals, and terminal-ipc returns its dispose
helpers so SSH teardown and app shutdown keep working.
Teknium