[Castor-o7]

Ticks CHOMP-5, and updates the README limits note for both CHOMP-5 and CHOMP-6.

CHOMP-5 evidence, on the reTerminal: arm64 bundles built by tools/bundle.sh in a node:22-bookworm container at 9513c0c. The device predated web updates, so the first ran by hand with install.sh --reuse, as the README says. The second, built as 9513c0c-upload, was POSTed with curl on the device to localhost/api/system/update: 202, status done, and /api/health then reported 9513c0c-upload, with carchompd active. Track data survived. The GPX and health half is covered by gpx_round_trip_and_health in CI.

Limits: the upload used the API on the device, not the System panel's button. No power cycle or failed-update case was run.

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Does not tick CHOMP-6. Updates the README's limits note and records this evidence. The network-off check is deferred by the operator, so the story stays open. No code changes.

Run on a Mac: real carchompd, dev PostGIS, tools/sim.py, pmtiles 1.31.2, Protomaps build 20261102.pmtiles.

• Cancel: a large region was at about 358 MB written when cancelled. DELETE gave 204; the job cleared, .partial was empty, no archive appeared, and no pmtiles process was left.
• Download: a Portland region at maxzoom 15 finished in about 10 s (4.5 MB), with the requested bounds and zooms 0 to 15. .partial was empty afterwards.
• Draw offline: headless Chrome with --host-resolver-rules blocking every host but localhost. Streets and labels drew inside the region and stopped at its edge. All 58 online tile requests were blocked, with no local errors.
• Control: after deleting the region, the same setup showed a dark background with tracks only.
• Delete: DELETE gave 204, the list was empty, and only .partial (empty) and assets remained.

Limits, for the reader to judge:

• The network was not actually off. Only the browser was blocked, because other sessions were using this machine's network.
• I called the API the Maps panel calls, with the build it would pick, rather than clicking the panel, so the panel's buttons and its confirm weren't exercised.
• Not run on the reTerminal, and the drawn view was checked by eye.

Story: CHOMP-6

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