Parse connector-scope capabilities from get_capabilities: supported_features, capabilities.protocol.features and supported_commands are read for orca devices even when the reply has no flags block, reset before each parse, and left untouched for Bambu.
Gate macro-backed AMS commands on fms plus the advertised command (change filament, select tray, control, user settings, RFID, drying stop); gate slot metadata writes on filament_slots. Unknown capability is not support.
Serialize PrintParams::ams_mapping2 into print.gcode_file.filament_mapping with the array position as filament_index and {255,255} dropped. The field is omitted when empty, so an unmapped print stays byte-identical. A mapped print is refused visibly while ORCA_FILAMENT_MAPPING_CORRELATION_VERIFIED is false or the connector did not advertise filament_mapping; the GUI predicate shares the serializer's definition so both gates agree. Refuse a partially mapped print that leaves a used filament without a target.
Return a non-success result from start_local_print_with_record so PrintJob falls back to start_print instead of treating an unsent print as success.
Tests cover serializer keying and omission, GUI/agent gate agreement, payload shape, the with_record result, capability parsing, and the per-command AMS gate.
Lam Wei Lun