fix: admit agent renames of agent-owned Cloud names; update pending machine row test

[teamleaderleo]

Cloud browser, sidebar and naming group for #13643. Failure details are from #13403's CI run 35688876556, the latest completed app-host run (the integration branch's own run stopped at static checks).

Fixed here

• "Failed agent rename keeps the accepted title and daemon naming authority", "Mirroring an agent-named placement does not block its next agent title" (CloudSidebarRenameReconciliation) and "An older automatic result and old snapshots cannot replace an accepted name" (CloudNameAuthority, the 2 SetAutoTitleSocketTests issues). Product regression from e6926fb (Repair main's full macOS suite: package test compile and app-host regressions #13403 repair). That commit added admitsTerminalRename to the automatic path of submitCloudPanelRename. Admission only let an agent replace an accepted name when the local panel still had .auto provenance. Since 1e1d319, accepted names reconcile as .remote and the owner is the tab's daemon nameAuthority, so every agent title after the first was refused. Fix: admit when no write is pending and the accepted tab name has auto authority. User-owned names, pending writes and local user titles still refuse it.
• pendingRowStepsAsideOnceItsMachineHasARow(). Stale test. Cloud: make New Machine creation optimistic #12919 (021f792) intentionally keeps a running create's pending-machine:<op> node ID on the adopted machine row. The test now asserts that ID and that the row is .machine showing the created machine, not a stand-in.

Already covered by #13651 (in this branch; waiting on the first app-host run)
The deferred Cloud browser, "Every Cloud website retains its requested URL" (x3), the empty local sidebar group, the captured sidebar row, the tab selection, and the three #13651 checks (MachinesPanelModel project group, "Sidebar and repeated opens…", "Unsupported providers…"). Each failed with destinationNotFound or downstream of it.

Left

• browserPanelRetriesDiscardedRestoreAfterConnectionRefused(). Host dependency. On some runners WebKit's load to the refused loopback port never settles. Even webView.stopLoading() leaves isLoading true for 10 s (line 63, added in b3755b8). The pre-b3755b8523 version passed in 17.7 s on runs 35715275879 and 35718469909 and timed out on others. The browser code is unchanged between those runs.
• visibilityToggleKeepsAppKitTableContainerMounted(). Reveal projects every row twice (10 vs 5). This happens on main-based branches too, since at least 09-20. I couldn't find the cause without an app-host run, so it's not fixed here.
• CloudSidebarNativeDrop already passes.

🤖 Generated with Claude Code

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Summary by cubic

Fixes a Cloud rename admission regression so agent renames of accepted names work again, and updates the pending-machine-row test for the current row identity.

• Accepted names reconcile as .remote with the tab's daemon nameAuthority, but admission only replaced accepted names when the local panel still had .auto provenance, so every agent title after the first was refused.
• Admission now allows an agent rename when no write is pending and the accepted tab name has auto authority; user-owned names, pending writes, and local user titles still refuse.
• pendingRowStepsAsideOnceItsMachineHasARow now expects the running create's pending-machine:<op> node ID to stay on the adopted machine row and verifies the row shows the created machine, not a stand-in.

^{Written for commit 17381ac. Summary will update on new commits.}

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