First receiver-stream audit

This completed first audit preserved the settings, clock and receiver evidence for six existing recordings. All original hashes and outer framing checks reproduced. It found complete Trimble survey-record envelopes in every file and GSOF receiver messages.

The strict receiver parser stopped in four streams at byte 0x15. Subsequent examination identified this as Trimble's documented single-byte NAK command response. It is not proof of source corruption, and the first parser did not silently skip it. The first audit's 10,331 assembled survey records therefore describe complete accepted prefixes, not the full six-file population.

The separately frozen revision implements documented ACK/NAK handling and decodes receiver-reported position uncertainty. This first manifest, source snapshot, completion and report remain preserved. Do not resume it with revised live sources. No Earth fit, eligibility change or original deletion occurred.