Public, data-first facade for Paclo.

Main entry points:
- `packets` for live/offline capture as lazy sequences
- `reduce-packets` for synchronous, low-allocation reduction
- `bpf` for BPF DSL -> string conversion
- `write-pcap!` for writing packet byte sequences

Public post-decode hook registry.

Hooks are applied to packet maps after decode and are intentionally isolated:
failures in one hook do not stop packet processing.

Quick REPL helpers for debugging and packet inspection.

- (parse-hex s)      ; hex string -> packet map
- (summarize pktmap) ; print concise summary
- (hexd pktmap)      ; render :bytes as hex

Example:
(-> HBH-OK parse-hex summarize)
(-> HBH-BAD parse-hex summarize)

Internal low-allocation flow projection for Ethernet IP packets.