fix(resume-patterns): return the most recent resume command from scrollback

[dormouse-bot]

Problem

detectResumeCommand scanned scrollback by matching each pattern against the whole joined text with a non-global regex:

const text = lines.join('\n');
for (const pattern of BUILTIN_PATTERNS) {
  const match = text.match(pattern.regex);
  if (match) return pattern.extract(match);
}

String.match with a non-global regex returns the first occurrence, i.e. the chronologically oldest one in the scrollback. When a pane resumes an agent more than once, each run prints its own resume hint (codex resume <id>), so the buffer holds several. session-save.ts persists the returned command as resumeCommand so a restored pane can resume the current session — but it was getting the stale, oldest id.

There was also a secondary recency bug across pattern types: codex was always checked before claude, so an older codex resume won over a more recent claude --resume.

Fix

Scan the last 50 lines newest-first and return the first match found, which is the most recent resume command regardless of type. Behavior for single-occurrence scrollback is unchanged.

Tests

Added two regression tests — repeated same-command hints (most recent wins) and most-recent-wins across pattern types. Both fail against the old first-match logic and pass with the fix. The existing seven tests are unchanged and still pass.

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