167b1026f175f2f5f655ffcfe6ff503fe49a65db
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>
convert
Makes unit conversions
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