Per user directive 2026-06-20: do not overwrite the v3 main review.
- Restored nagent_review_v3_20260619.md to its v3-final content (803 lines, from commit b49be820)
- Created nagent_review_v3_1_report_20260620.md (NEW, 2900 lines) for the v3.1 thickened content
- Kept nagent_review_v3_1_20260620.md as the delta summary doc (66 lines)
- Updated metadata.json with v3_1_file_separation field documenting the file structure
The v3 main review is preserved in git history and is recoverable via 'git log -p'.
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