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1a0ce51f38
A marker definition validated its BPF N times — once per link in the fan-out (start_marker runs validate_bpf_syntax on every copy), spawning one tcpdump -d subprocess per link for the same expression. Definitions did not validate BPF at all; only direction was checked. Move the single validation point to the definition layer (create/update), and validate each definition's BPF on project load (dropping any that have gone invalid, like private markers). The inherited fan-out (start_marker) and def sync (update_marker) now skip validate_bpf_syntax for inherited copies, since the BPF comes from an already-validated definition. Private per-link markers still validate inline as before. uBridge still runs pcap_compile at install, so an invalid expression can never slip through. Creating a definition over N links now runs one tcpdump instead of N.