Two unused helpers and a missing comment in the lib/ surface, found
during the Pillar 8 sweep.
- `readState` in `lib/default.nix` was exported but has no external
callers — only `readHomeState` and `readSystemState` use it
internally. Removed from the export list; the function stays in the
let-block (still wraps the two public readers).
- `getWithDefault` in `lib/state-schema.nix` was a complete dead
function: declared as a path-walking fallback helper but never called
anywhere in the tree. core/{system,home}/state.nix use inline
`togglesState.<key> or schema.<scope>.<key>` instead. Removed.
- Added a header comment to `lib/state-schema.nix` explaining the
schema's boundary — it lists every state.json field consumed by a
Nix option, but state.json may also hold runtime-only fields
(`welcome_done` from `nomarchy-welcome`) that are intentionally
off-schema because no Nix option reads them. Future readers will
otherwise think welcome_done is an orphan.
Logged a Later-column roadmap row for consolidating `flake.nix`'s
palette/themeNames re-imports with `nomarchyLib` so the theme list has
one source of truth instead of two.
27d1506b54