chore: remove training data JSONL files from repo

Remove 8 training data files (~24.5 MB) that were committed to root:
- training-data-combined.jsonl (5.5M)
- training-data-optimal-v2.jsonl (1.9M)
- training-data-optimal.jsonl (1.4M)
- training-data-sourcemaps.jsonl (3.3M)
- training-data-v2-compact.jsonl (2.2M)
- training-data-v2-filtered.jsonl (8.9M)
- training-data-v2.jsonl (1.1M)
- training-data.jsonl (216K)

Add training-data*.jsonl to .gitignore to prevent re-addition.

Co-Authored-By: claude-flow <ruv@ruv.net>

.gitignore

@@ -125,6 +125,9 @@ examples/*/dist/
 *_report.svg
 *_sky_map.svg
 
+# Training data
+training-data*.jsonl
+
 # Extracted code artifacts
 claude-code-extracted/
 examples/open-claude-code/