feat(3jane): add USD3/sUSD3 monitoring

[spalen0]

Summary

• Add monitoring for 3Jane protocol (credit-based money market, modified Morpho Blue fork) per 3jane monitoring #160
• Tracks USD3 (senior tranche) and sUSD3 (junior/first-loss tranche) ERC-4626 vaults on Ethereum mainnet
• Monitors 5 key risk signals: PPS decreases, TVL changes, junior buffer ratio, vault shutdown, and debt cap changes
• Uses batched RPC calls (6 reads in 1 batch) for efficiency, runs hourly

Monitoring Checks

Check	Alert Condition	Why It Matters
PPS (Price Per Share)	Any decrease in USD3 or sUSD3	Indicates loan markdowns or defaults — critical since loans are unsecured
TVL	>15% change in USD3 or sUSD3 totalAssets	Large deposits/withdrawals or protocol-level events
Junior Buffer	sUSD3 < 15% of USD3 TVL	Thin first-loss coverage puts senior tranche at risk
Vault Shutdown	isShutdown() becomes true (alert-once)	Emergency shutdown activated
Debt Cap	Any change to ProtocolConfig.getDebtCap()	Governance scaling the protocol up or down

Current Live Values

• USD3 TVL: $22.90M, PPS: 1.15556
• sUSD3 TVL: $7.04M (in USD3), PPS: 1.06624
• Junior buffer: 30.76% (healthy, well above 15% threshold)
• Debt cap: $8.65M

Test plan

• Script runs successfully with live on-chain data
• Caching works correctly (second run shows matching previous values, no spurious alerts)
• Ruff format and lint pass
• No mypy errors in 3jane code
• Verify Telegram alerts work with configured bot token/chat ID

Closes #160

🤖 Generated with Claude Code

[spalen0]

Linked PRs

• Envio indexer PR (adds 3Jane TimelockController to indexer): feat: add 3Jane TimelockController to indexer chain-events/yearn-indexing-test#11

Deploy order: Envio indexer first (to start indexing events), then this monitoring PR.