valve's schema mode enum includes `maintenance` (which gates sources)
but the FSM has no `entermaintenance` / `exitmaintenance` states and
the schema's `sequences` block has only startup / shutdown /
emergencystop / boot. Maintenance mode therefore disables external
sources but doesn't run a maintenance sequence — different shape
from rotatingMachine. Added a Limitations section to the CONTRACT so
this is explicit rather than surfacing as a wiki TODO.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Refactor of valve to use the platform infrastructure (BaseDomain, BaseNodeAdapter,
ChildRouter, commandRegistry, statusBadge). Extracts concerns into
focused modules per .claude/refactor/MODULE_SPLIT.md generic template.
Tests stay green; CONTRACT.md generated; legacy aliases preserved.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>