A switch presents transceiver compatibility ONLY if ports_verified=true (its port
config confirmed against the manufacturer datasheet). Unverified switches return
NO suggestions rather than potentially-wrong data. New columns: ports_verified,
ports_verified_source, ports_verified_at. Verified so far against datasheets:
HPE Aruba CX 10000-48Y6C, NVIDIA SN3700 (corrected 100G->200G QSFP56), SN4700,
SN5400, SN5600. 262 switches still pending datasheet verification.
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