phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

docs/guides/scope-hints.md

@@ -35,6 +35,6 @@ Runtime Trace
   - `[mir][hint] ScopeLeave(0)` at function exit
 
 Example
-- `apps/tests/macro/if/assign_both_branches.nyash` emits JoinResult(x):
+- `apps/tests/macro/if/assign_both_branches.hako` emits JoinResult(x):
   - `if (cond) { x = 10 } else { x = 20 }`
   - Both branches assign `x`, builder hints the join.