docs(training): record stage six league evidence

TRAINING.md

@@ -142,10 +142,24 @@ early reference to see absolute progress over time.
 The evaluator launches Godot with the explicit headless display driver,
 Compatibility renderer, dummy audio driver, and a temporary writable log path
 so evaluation is reproducible on machines where the default renderer or
-`user://` log location is unavailable. A two-seed smoke check on 2026-09-01
+`user://` log location is unavailable. On 2026-09-01, the current Stage 6
-completed 10 paired episodes per seed for the current Stage 6 export versus
+export completed the full 100-episode paired evaluation against each of its
-`hard.json` (both runs finished 3–5 with 2 draws); this is only a runtime
+three league references on the independent seeds 19 and 43 (seed 1 was already
-smoke and is not promotion evidence for the Stage 6 gate.
+recorded in `eval_history.json`):
+
+| Seed | Stage 3 reference | Stage 4 reference | Stage 5 reference |
+| --- | ---: | ---: | ---: |
+| 1 | 79–17–4 | 60–31–9 | 32–51–17 |
+| 19 | 82–13–5 | 65–21–14 | 40–42–18 |
+| 43 | 74–17–9 | 58–27–15 | 36–54–10 |
+
+Cells are candidate wins–reference wins–draws. The candidate clears the
+documented 15% reference-regression margin against Stage 3 and Stage 4 on all
+three seeds, but fails against Stage 5 on seeds 1 and 43 and is effectively
+even on seed 19. The physical-team splits stayed within the 20% diagnostic
+ceiling. This is independent runtime evidence, not promotion evidence: Stage 6
+remains open and requires another training attempt or an explicit human
+decision after reviewing the Stage 5 regression.
 
 If a model was trained with the locomotion mask on (curriculum stages 1, 2,
 and 5 — see below), pass `--grounded-a`/`--grounded-b` for whichever side it's on.