Screen groups now run genuinely in parallel under the team-size
setting, with live progress, per-group replay on completion, and
distinct per-group agent identities announced as a facts line
(sequential runs announce their setting too, so the active mode is
always visible). Identity is single-sourced: sequential runs tag no
frames and inherit the session identity, concurrent runs adopt a
pre-confirmed identity as the primary group. Shared navbars are
unified across screens and injected into screens whose name matches a
reference tab, so a failed nav subtask can no longer leave a screen
bare. Failed subtasks keep their full spec for single-shot retry, the
salvage pass retries at minimal complexity instead of repeating the
full ladder, rate-limit exhaustion is classified non-retryable, and
the stalled-provider tests assert connection counts instead of wall
clock.
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