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Age	Commit message (Collapse)	Author
2026-03-26	Add Phase 9B+9C: periodic refit fails, top-down curriculum neutral	YurenHao0426
	Phase 9B (periodic refit K=5 R=1 alpha=0.75): 14.0% — Vec starts random, periodic refits insufficient without offline pretraining. Phase 9C (top-down curriculum): last1_vec=30.8%, last2_vec=31.1% vs DFA=31.2%. Near-neutral. Cold-start problem persists even for single-block Vec. Only Phase 9A's offline prefit + blend handoff (+1.5%) works. The key ingredient is offline Vec training on frozen checkpoint features. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>