COLLECTOR-INTEGRATION.md told integrators that machinenumber maps to
Asset.assetnumber and that a real value updates it on an existing PC. That is
precisely the behaviour that returned 500 to every bay reporting a machine
ShopDB already knew, and it is the document another site reads to build its
reporter.
Rewritten to say what the field is for: it identifies the machine, the PC keeps
its hostname, and the number builds a controls link. Adds a section covering
the claim-versus-handover rule and its quiet window, the alert gate defaulting
off, and how a part-marker PC gets its own marker asset under the operation.
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