Implementation registry

The owner calls setImplementation(templateId, implementation, approved). Approval requires a non-zero ID, deployed bytecode, and a readable non-zero creator(). Replacing one implementation for an ID automatically disables the previous implementation. Approval controls official verification, not whether third-party clients can create a market.

• Implement IState.read() returns (bool).
• Be compatible with OpenZeppelin minimal proxy clones.
• Expose a one-time initializer because clone constructors do not run.
• Expose an immutable, non-zero creator() for the 10% template-creator trading-fee allocation.
• If the template exposes stateDeadline(), it must return the market deadline and can only be created with At deadline resolution.
• Define manipulation resistance and failure behavior in the reader itself.

Both verified and unverified implementations must expose creator(). For unverified third-party templates this value is self-reported by the implementation. Official templates inherit StateTemplate, which records the implementation deployer as an immutable creator. Official clients do not index, display, trade, or resolve zero-template-ID markets.