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Usage:
python3 tools/pcap2fixture/convert.py [--out-mode bench|adversarial]
Reads every file in `incoming/`, dispatches by extension:
.har → HAR v1.2 parser
.txt → curl --trace-ascii parser
.pcap → scapy parser (requires `pip install scapy` + TLS keys)
Emits files into `bench/src/fixtures.rs` (bench mode) or
`adversarial-corpus/<vendor>/<id>.json` (adversarial mode).
Stub for now — protocol locked so the implementation can land
incrementally without disrupting consumers.
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