Gate review (Codex) reproduced two SILENT regressions in the generation-token
ownership change, both validated against PR head + merge base:
1. sessions.js:1428 — the no-op early-return did NOT fire for a redundant
same-session load (currentSid===sid, !_loadingSessionId was false because a
keep-stale refresh was in flight). The redundant loadSession() then bumped
_loadSessionGeneration and CANCELLED the authoritative in-flight refresh —
stale rows remained while message_count advanced, so later polling could not
detect them. Restore the pre-existing behavior: also return when the in-flight
load is for the SAME sid (!_loadingSessionId || _loadingSessionId===sid).
2. sessions.js:2781 — _ensureMessagesLoaded's finally cleared the
transcript-width reload hint unconditionally, so a stale same-session response
collapsed a long session to the default tail window. Guard the cleanup with
_ownsLoad() so only the owning load clears the hint.
Both fixes retain the PR's cross-session, same-session-rejection, and INFLIGHT
race behavior (47 tests pass incl. the new isolation suite + the 4 edited files).
Co-authored-by: starship-s <starship-s@users.noreply.github.com>
