feat(contract): add on-chain reputation scoring#354
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I have completed the implementation of Issue #349: On-chain reputation scoring for payers and creators.
Summary of Accomplishments
Reputation Engine & Data Structures:
Defined RepScore (paid_on_time, late_pays, invoices_released, invoices_refunded) in types.rs.
Mapped persistent storage key rep_key(address) -> (symbol_short!("rep"), address).
Added public view methods get_rep(env, address) -> RepScore and get_reputation(env, address) -> u64.
Invoice Reputation Gating & Auto-Updates:
Extended InvoiceOptions, InvoiceExt2, and Invoice with pub min_payer_rep: Option.
Added gating check in _pay() rejecting payers with insufficient reputation ("insufficient payer reputation").
Updated _pay() to record paid_on_time or late_pays.
Updated _release_full() to increment creator invoices_released.
Updated refund() to increment creator invoices_refunded.
Event Emissions:
Added events::rep_updated emitting event topic (symbol_short!("split"), symbol_short!("rep_upd"), address) with payload RepScore.
Quality & Verification:
cargo fmt: All files formatted.
cargo clippy --all-targets -- -D warnings: Passed with 0 errors, 0 warnings.
cargo test --workspace: 264 tests passed, 0 failed.
Git Workflow:
closes #349