[P1-3] Contract ABI & Constants

[realproject7]

Context

Define the event ABIs and contract addresses so the indexer can parse onchain events. Contracts aren't deployed yet, but the event signatures are finalized in §4.1 and §4.3.

Sub-tickets

• P1-3a: Create lib/contracts/abi.ts — define ABIs for PlotChained, StorylineCreated, and Donation events. Include the chainPlot and createStoryline function ABIs for frontend contract calls.
• P1-3b: Create lib/contracts/constants.ts — placeholder addresses for StoryFactory, $PLOT token. Include the known addresses from §12 (MCV2_Bond: 0xc5a076cad94176c2996B32d8466Be1cE757FAa27, MCV2_BondPeriphery: 0x492C412369Db76C9cdD9939e6C521579301473a3, Uniswap V4 Router, Permit2, ERC-8004 registry: 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432).

Proposal Reference

§4.1 (Contract events), §4.3 (StoryFactory), §12 (External Dependencies)