Three failure modes in the YAML store: maps nested inside lists (the
documented keymap-overlay shape) fell through _emitScalar to
toString() and corrupted on the next read; writes went straight to
the live file, so a crash mid-write truncated every setting; and a
parse failure silently returned an empty map that the next set()
wrote over the user's file. Maps in lists now emit as YAML flow
mappings, writes are temp-file + rename, and an unparseable file is
preserved as .broken with a warning through the kernel Logger (new
onError hook, wired in the facade).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
e413380ea9