Upgrade tracker.

1. 01

   Adds bounded looping so repeated contract logic no longer needs to be fully unrolled in bytecode.

2. 02

   Introduces OP_DEFINE and OP_INVOKE so contracts can factor logic into reusable functions instead of duplicating it.

3. 03

   Makes Pay to Script standard and raises standard transaction limits for larger unlocking bytecode and token commitments.

4. 04

   Re-enables bitwise operations so contracts can work with binary data more directly and efficiently.

Layla is one of BCH's biggest post-CashTokens contract upgrades, reducing script duplication while unlocking safer covenant, privacy, and advanced financial designs.