Remove monetary bounty; falsification challenge is credit-only

Withdraws the $50-per-root-cause offer. Verified divergences are credited by name in HALL-OF-DIVERGENCE.md.

README.md

@@ -125,14 +125,15 @@ enough information for strangers to converge on identical bits — across an ISA
 boundary, a compiler boundary, a language boundary, and a CPU/GPU boundary,
 with no implementation consulting another.
 
-## Falsification bounty
+## Falsification challenge
 
-There is a standing $50-per-distinct-root-cause bounty for breaking this:
+Try to break it. Verified divergences and reproductions are credited by name in
+HALL-OF-DIVERGENCE.md:
 https://github.com/Aefinity-AI/alice-aegis/blob/main/CHALLENGE.md — write your
 own implementation from `CIS2_SPEC_v0.3b.md`, in any language for any device,
 and get a different digest. If the disagreement is because the spec text permits
-two readings, that is the finding most worth paying for: it means the document
-is not yet sufficient, which is the entire thing CIS-2 claims to be.
+two readings, that is the most valuable finding: it means the document is not
+yet sufficient, which is the entire thing CIS-2 claims to be.
 
 ## Results: single-weight corruption detection (2026-09-13)