_parse_waiting_until scanned only the pane's last non-empty line for footer_ui backends (claude/
opencode) — but their input-box footer always renders BELOW the agent's final message, so the marker
was never seen and WAITING-UNTIL was effectively dead for claude agents. It's only consulted once the
pane is already idle, so scan the whole capture and take the most-recent marker (the footer never
contains it). Add waiting_until_max (default 7200s) so an agent can't park its own reboot forever.
Tests: footer-honors-marker-above-footer, takes-most-recent, defer + cap in stall_check_one; make the
stall harness's patch() idempotent so a re-patched name doesn't leak into tearDown. 66 pass.
notplants
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