refactor: normalize event symbol naming across all contracts

[ryzen-xp]

📝 Description

Auction uses AUCR_CRT and BID_PLCD (abbreviated), alien-gateway uses TRANSFER and ROOT_UPD (mixed). Standardize to consistent UPPER_SNAKE max 9 chars across auction, factory, escrow, and alien-gateway. Add EVENTS.md documenting each symbol.

✅ Requirements

• Auction uses AUCR_CRT and BID_PLCD (abbreviated), alien-gateway uses TRANSFER and ROOT_UPD (mixed)
• Standardize to consistent UPPER_SNAKE max 9 chars across auction, factory, escrow, and alien-gateway
• Add EVENTS.md documenting each symbol.

🎯 Acceptance Criteria

• Implementation matches the description above
• Tests added or updated to cover the new behaviour
• cargo test and cargo clippy pass with no warnings
• CI (Smart Contracts CI) passes

📁 Expected files to change

• gateway-contract/Cargo.toml

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💬 Commit: refactor: normalize event symbol naming across all contracts
🌿 Branch: refactor/normalize-event-symbol-naming-across-all-contracts | Priority: LOW | Difficulty: ☕ one-coffee

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Type: Refactor · Priority: LOW · Difficulty: ☕ one-coffee · Track: Contract

[victor62-art]

@victor62-art has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

pls assign to me

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[drips-wave]

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