feat: add Plasma mainnet chain and USDT0 token

[dirkpage]

Summary

• Adds Plasma mainnet (chain ID 9745) to the production EVM chains with RPC https://rpc.plasma.to, prod portal, and Hyperlane prover
• Adds USDT0 token (6 decimals, 0xB8CE59FC3717ada4C02eaDF9682A9e934F625ebb) deployed on Plasma mainnet

Test plan

• eco-routes-cli chains lists Plasma in production chains
• eco-routes-cli tokens lists USDT0 with correct address for chain 9745

🤖 Generated with Claude Code

[eco-ai-app]

Overview

The PR introduces configuration for the Plasma mainnet and the USDT0 token. The blockchain security agent found no issues with the declarative configuration changes. However, the QA agent noted a lack of automated test coverage for the new chain and token configurations, relying solely on manual CLI checks.

Highlights (2)

Severity	Location	Description	Agents
🟡 Warning	src/blockchain/chains.config.ts:97	No automated test was added to verify that the Plasma mainnet entry appears in RAW_CHAIN_CONFIGS with the correct properties.	agent-qa
🟡 Warning	src/config/tokens.config.ts:139	No automated test was added to verify that USDT0 is present in TOKEN_CONFIGS with the correct address and decimals.	agent-qa

QA & Test Coverage · 2 warning

Severity	Location	Category	Description
🟡 Warning	src/blockchain/chains.config.ts	missing-test-coverage	No automated test was added to verify that the Plasma mainnet entry (chain ID 9745) appears in RAW_CHAIN_CONFIGS with the correct id, rpcUrl, portalAddress, and prover address. The test plan items are manual CLI checks only.
🟡 Warning	src/config/tokens.config.ts	missing-test-coverage	No automated test was added to verify that USDT0 is present in TOKEN_CONFIGS with the correct address for chain '9745' and the expected decimals (6). The PR test plan relies entirely on manual CLI inspection rather than a regression-safe assertion.

Web Security

Skipped: not applicable to this PR — No web security concerns in chain and token configuration additions

Blockchain Security

No issues found in this domain.

Performance

Skipped: not applicable to this PR — Configuration additions are unlikely to impact performance

Stats

Metric	Value
Reviewers	4
Successful	2
Skipped	2
Failed	0
Total findings	2
Cross-domain	0
Tokens (in / out)	26578 / 1307

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Automated review by Eco's specialized review team. Architecture, business logic, and correctness remain with the human reviewer.