v0.4.8

[0.4.8] - 2026-08-27

Fixed

• keel approve --stage merge picked the wrong G3 result. Run IDs use
  a hashed suffix that is not monotonic within a day, so lexicographic sort
  picked an older failed G3 over a newer passing one — reporting "G3 is FAIL"
  right after G3 passed. Now uses generated_at timestamps to find the
  truly latest result.