fix: subgroup check in r-check branch for TE and SW#193
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Replace the no-op constraint in the r-check witness allocation path with a real subgroup check. For both Twisted Edwards and Short Weierstrass gadgets, enforce that (r-1)ge equals -ge by checking ge.negate() == result. This restores the intended prime-order subgroup enforcement parity with enforce_prime_order and prevents bypassing constraints.