docs: record the fourth field session

[antoinevalentinHA]

Documentation only. Records a fourth field session and corrects what it contradicts.

What the session adds

The first to run the released commit (0.4.3-fork.1 at 45e3a55), and the first to exercise the provenance check on a device. Earlier sessions could only show that reusing a conversion could be correct and that timestamps could not establish it. This one produced a verdict: a converted pack was compared against the source it was supposedly made from, and the two were proven to differ.

Two phases:

• Nine adds of previously unseen UUIDs — index 33 → 42, nine Pack added., no incident, and no question asked, since none had a conversion to reuse.
• Three same-UUID replacements on packs whose content had genuinely changed — each 42 → 41 then 41 → 42, mismatch every time, re-converting sent the right content. Final state 42 packs, no INVALID_STATE_ERR, no libusb error, no HTTP 500.

Two behaviours are observed here for the first time. Replacing a pack has to be done as delete then transfer, which is the refusal of a pre-existing content folder seen from the outside. And the dialog says which of its two answers it is giving, so the verdict is readable on screen without a log — the two wordings are quoted from the shipped strings rather than paraphrased.

The section also records why 0.4.3-fork.1 does not name a build: the version is fixed rather than a snapshot, so master kept declaring it after moving past 45e3a55. A field report has to give the commit, and say whether the runtime was the published asset or a local rebuild. This one was a local rebuild — same tree as the published archive, different binary.

What it contradicted

Four passages are corrected because the new section would otherwise sit against them in the same file:

Was	Is
tying a conversion to its source "is still an open problem"	put in the past, and marked solved since for conversions made after the work landed
Not proven: "that a given converted instance was produced from a given source"	narrowed to conversions made before provenance was recorded
What is still open: "C7-1 … did not make it knowable"	same narrowing; later conversions carry a record and are checked against it
"two sessions" exercising the reworked write path	three — the first session predates that code

The READMEs move from three documented sessions to four, in both languages.

Naming

Packs are designated neutrally — personal pack 5–7, continuing the numbering the file already uses — and identified by the leading bytes of their UUIDs, which is what carries the uniqueness evidence. No work titles, verified across the whole tracked tree. The UUIDs of the packs that were added but not replaced are not reproduced: they carry no evidence.

Left alone deliberately

Two claims under What is still open are stale for reasons unrelated to this session, so they are flagged rather than fixed here: that retrying a failed upload has no defined semantics (it is now explicitly refused), and that nothing reports partial states at connection time (a listing exists, with no caller). Separate matter.

The FAT incident, the limits, and everything the sessions do not establish are untouched. No crash-safety is claimed anywhere.

No code, no test, no POM, no workflow, no TESTING.md. No tag created or modified, no release modified.

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