test(edit-history): the live conversation wins even when older; tighter wiring guard

Review round 3 (all low):
- the "written last" test left solo newer than conv-1 for the rest of the
  file, so the live test passed by mtime alone. solo's mtime is reset in a
  finally, and the live test now runs with the live transcript older than
  the stored one (a /resume into an older conversation before it writes).
- the server wiring guard matches the remote branch of the ternary as one
  expression, so swapped branches fail it.
- note on whole-second `-nt` (BusyBox, bash 3.2) at the lookup.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/remote-files.ts

@@ -542,6 +542,8 @@ export function buildRemoteClaudeTranscriptLocateCommand(ids: readonly string[],
     'best=',
     ...claudeConfigDirLines(),
     // newest <id>: `best` becomes that id's transcript if it is newer than the current best.
+    // BusyBox's (and bash 3.2's) `-nt` compares whole seconds: a tie keeps the earlier id, the
+    // stored conversation, until the next write; only without a live id.
     'newest() {',
     '  for f in "$cfg"/projects/*/"$1".jsonl; do',
     '    [ -f "$f" ] || continue',