* Restore KTO logps truncation guard for TRL (re-apply dropped #5996)
#5996 ported the KTO truncation guard to TRL's _compute_logps refactor but was
dropped from main in the 2026-06-05 history rewrite. Re-apply the
unsloth/models/rl_replacements.py guard (kto_trainer_get_batch_logps +
kto_trainer_align_completion_logps); its regexes still match TRL main's current
compute_ref_log_probs / _compute_kl_logps shape
(per_token_logps = selective_log_softmax(shift_logits, ...)), so the guard
remains effective.
Also extend the version_compat detection to recognize that current shape: TRL
refactored KTO again (no get_batch_logps / _compute_logps), so the test was
failing on TRL main even though the rewrite still applies.
* KTO patcher: match single or double quotes in dict-key regexes
Per review: _KTO_COMPLETION_RE / _KTO_KL_RE hardcoded double quotes for the
TRL dict keys, so a formatter or TRL version using single quotes would make the
patch silently skip. Accept both quote styles. Verified the regexes still match
TRL main's current experimental/kto source.
e20a6c3020