NormalizeNode re-selected ports whenever the request merely CONTAINED
port/serverId keys; the browser form always submits them (port=null in
random mode), so every save re-rolled both entry and exit ports. Now an
assigned port only moves on an explicit addressing change: mode switch to
random, a different fixed port value, or a server move where the port is
taken (fixed mode surfaces the 409). random->fixed pins the current port.
Regression: portlock_test.go (UI-shape payload saved twice, rename-only,
mode switches, fixed change/conflict, server move free/taken).
Golden re-captured: diff confined to nodePatchUiStyle/nodePatchJobs/
nodesAfterPatch/backup port leaves returning to the seed ports.
Single-source Go from this round on: golden.mjs replays a fixed API script
against a Go panel seeded from the difftest seed DB and diffs every response
(learning-normalized) against golden.json. 25 sections: lists, credentials,
all subscription formats, deploy job payloads, usage/presence, UI-style node
PATCH, /api/system shape, backup, error cases.
aaaamoooo