docs(traffic): full Pangolin protocol report, from all ten captures

[pyramation]

Summary

tools/traffic/PROTOCOL.md becomes a standalone report you can work a show day from, after re-running decode over all ten captures. Two findings in it are new:

The hand-sent OSC was addressed to zones that don't exist. 00-osc-only.pcapng contains 90 packets, 15 each to zones 240–245, while the only zones BEYOND has ever broadcast are 1–6. The {n} comes straight from projectorMap[i] in encodeBeyondMessages, so this is a project-config fault independent of the closed RGBA panel — a second reason those sends could not have changed a colour.

Frames and control messages share one budget. Idle captures: ~62 frames/s, zero 0x00010E02 control messages. The paint capture: 16–23 frames/s plus 31–37 control/s, with the combined rate pinned near 53–54/s. So control is interleaved while live content changes, at the cost of frames. Also documents a previously unrecorded message type, 0x00028010 — 32 B, all-zero body, FB4→BEYOND, the one body in the protocol that isn't opaque.

The report now also has: the device/port inventory (including 53.5 reconnecting on a different ephemeral port between capture sets, which is the cheapest chance at the never-captured handshake), a worked hex example of the 32-byte header, a per-capture evidence table, an explicit confirmed-vs-inferred split, a four-item "what's missing and the exact capture that closes it" section, and a diagnostic playbook keyed to wire evidence.

One code change, from spotting nonsense in the output:

# a single message spans whatever gap its neighbouring packets happen to have
format_rate(1, 0.0000038)  # was '263157.9/s', now '—'

Link to Devin session: https://app.devin.ai/sessions/ec43152136134467a853ec0bbf783ea9
Requested by: @pyramation

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