Fix the bots' corner bias; settle seat order and RULES v0.9 (6.2, 6.8)

Bots now pick their start square and break path ties in their own
corner's frame; the absolute tie-break made corners 1 and 2 win 25-28%.
With that fixed, seat order is within target at 4 players, and a +1
stripe first-player bonus (new switch) gains only ~1 point, so no
compensation. RULES.md v0.9 lists the tested alternatives; the plan has
the 6.8 consolidation run and the seat-order study.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

RULES.md

@@ -1,9 +1,9 @@
-# Il Labirinto del Dojo — Rules (draft v0.8)
+# Il Labirinto del Dojo — Rules (draft v0.9)
 
 Working language: English. The final gift edition will be produced separately in Italian.
 
-Items marked **[VARIANT]** are unresolved and will be decided by simulation (see
-[Rule variants under test](#rule-variants-under-test)).
+Every rule has been checked by simulation; alternatives that were tried and set aside are
+listed under [Tested alternatives](#tested-alternatives).
 
 ## Goal
 
@@ -174,14 +174,16 @@ All other cards are shown and resolved immediately.
   - **Challenger loses**: −3 and sent to Start. The defender gains nothing.
   - If the challenger plays Uke and loses, they return to the square they entered from instead of Start.
 
-## Rule variants under test
+## Tested alternatives
 
-Parameters to validate by simulation: square mix; game length.
+Tried in simulation and set aside; the simulator keeps them as switches:
 
-Tested and set aside (simulator switches only): Exam ties to the defender; best-of-3 Exam;
-Kiai +1; a failed Exam costing 0 or 1 stripe instead of 3.
-Earlier rules kept as simulator switches: Fatica costing only when you stop on it; Kumite
-allowed in the first round.
+- Final Exam: ties to the defender; best of 3; the defender fighting with their own belt.
+- Kiai +1 instead of +2.
+- A failed Exam costing 0 or 1 stripe instead of 3.
+- Fatica costing a stripe only when you stop on it.
+- Kumite allowed in the first round.
+- One extra starting stripe for the first player.
 
 ## FAQ