`src/config-adoption.ts` owns config/layout with revision and fingerprint;
the host keeps `_serverCfg`/`_cfgRev`/`_layout`/`_layoutRev` as delegates.
All seven authoritative adoptions go through `adoptAuthoritativeGated`
(backdrop readiness → continuity → adopt → profile tail); the post-write
paths (space/delete ×2, optimize_undo, import/apply) gain the gate and take
revisions from the re-read bodies. `rollbackOptimistic` moves to the owner;
plan-optimize, space copy and the vacuum writers stop assigning identity.
Issue: #500
User-Visible: no
Treat explicit empty route lists as authoritative, preserve them through single-space export, group deleted-space routes, and render vacuums from the immutable vacuum-only snapshot subset.
Issue: #443
User-Visible: yes
settings.decor_default_style (all fields optional, validated) seeds
_decorStyle once from the first config that arrives; every UI change of
the session default flows through one runtime method with a 1s debounce
and the ordinary serialized expected_rev write path. The built-in default
is stored as the absence of the key; a partial or garbage key falls back
per-field. decorStyleFromSettings/decorStyleToSettings are the single
snake_case<->camelCase conversion point.
User-Visible: yes
Issue: #377
claude[bot]