Full Phase 9A: blend(0.75) outperforms DFA by +1.5% across multiple t0

Best configs (seed=42):
- t0=5, blend_075 (75%Vec+25%DFA): 32.6% vs DFA 31.0% (+1.5%)
- t0=10, blend_075: 32.5% vs 31.0% (+1.4%)
- t0=1, blend_05: 31.9% vs 31.0% (+0.9%)

Higher Vec fraction (0.75) consistently outperforms lower (0.25, 0.5) at t0>=5.
Pure Vec handoff still fails at all checkpoints.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

1 files changed, 19 insertions, 1 deletions

diff --git a/NOTE.md b/NOTE.md
index 258b20e..70eba38 100644
--- a/NOTE.md
+++ b/NOTE.md
@@ -5,7 +5,7 @@
 - **pilot**: Controlled iteration (commits 0b9ebb2, 7baf7ae)
 - **frozen**: Code at commit 0b9ebb2 for all reported results
 
-## Status: PHASE 9A — BLEND HANDOFF OUTPERFORMS DFA (+0.55%)
+## Status: PHASE 9A FULL — BLEND(0.75) OUTPERFORMS DFA BY +1.5%
 
 ---
 
@@ -504,5 +504,23 @@ This is Case B: pure Vec handoff fails, but blend works.
 Vec provides complementary directional credit that DFA alone lacks.
 DFA stabilizes the trajectory while Vec adds learned corrections.
 
+### Full Phase 9A Results (seed=42, all t0 × alpha)
+
+| t0 | Branch | final acc | diff vs DFA |
+|----|--------|-----------|-------------|
+| 1 | continue_DFA | 0.310 | — |
+| 1 | blend_05 | **0.319** | **+0.9%** |
+| 1 | blend_075 | 0.313 | +0.3% |
+| 5 | continue_DFA | 0.310 | — |
+| 5 | blend_05 | 0.317 | +0.6% |
+| 5 | **blend_075** | **0.326** | **+1.5%** |
+| 10 | continue_DFA | 0.310 | — |
+| 10 | blend_05 | 0.318 | +0.7% |
+| 10 | **blend_075** | **0.325** | **+1.4%** |
+
+**Best config: t0=5 or 10, blend alpha=0.75 (75% Vec + 25% DFA), +1.5%.**
+Higher Vec fraction (0.75) outperforms lower (0.25, 0.5) at t0=5,10.
+Pure Vec handoff still fails at all t0.
+
 ### Experiment IDs (Phase 9)
 - `checkpointed_handoff/`: Phase 9A checkpointed handoff with branches