Track match_play.py's real dependencies (tune_eval_dna.py, filter_pgn.py) and Scott's overnight-SPRT shortcut (test_vs_head.sh); gitignore generated caches/PGN output.

tune_eval_dna.py isn't Texel-tuning-specific tooling anymore -- it's a
load-bearing dependency (match_play.py does `from tune_eval_dna import
Engine`), so it needs to be tracked for match_play.py to run at all on
a fresh checkout, independent of whatever happens to the rest of the
auto-tuning pipeline. filter_pgn.py (builds twic_filtered.pgn, the
pool match_play.py's --pgn points at) is similarly not tuning-specific.

test_vs_head.sh is Scott's shortcut for the overnight SPRT run
discussed this session (head_reference/typhoon vs. current build,
--games 20000 --workers 20 --st 1 --sprt --elo0 0 --elo1 5).

Left untracked, Texel-pipeline-specific and matching this session's
move away from auto-tuning: bake_dna.py, dna_diff.py, dna_trend.py,
cycle.sh, run_ecm.sh, compare_ecm_*.py, tuned.dna.

.gitignore: eval_tune/__pycache__/ and eval_tune/opening_cache/ (pure
regeneratable caches) and src/{match_games,self_play_games}.pgn
(match_play.py's --pgn-out game logs, generated output not source) --
the dna/first.dna / dna/original_baseline.dna accidental-commit from
earlier tonight was exactly this class of mistake, catching the
obvious repeat cases now.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01M9ZDiJhiUajUxh95mTXCFJ

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