feat: add Tempo testnet support

[mejango]

Summary

• Add Tempo to Sphinx testnets configuration
• Add Tempo sucker deployer config in fee project setup (chain ID 42429)
• Add security tests (REVTempoSecurity.t.sol — 7 tests)
• Add Tempo testnet RPC endpoint to foundry.toml

Context

Tempo is an L1 blockchain where the native token is USD (not ETH). The revnet deployer needs to handle Tempo-specific sucker configuration:

• On L1 (ETH), if tempoDeployer is available, add a 4th sucker config for Tempo
• On Tempo (chain ID 42429), deploy a single sucker back to ETH
• Token mappings use NATIVE_TOKEN <-> NATIVE_TOKEN for now (TODO: update to WETH when deployed on Tempo)

Key findings

• Auto-issuance entries are filtered by block.chainid at deploy time (REVDeployer.sol:1209), not at read time
• Non-CCIP suckers (e.g., Arbitrum) reject mixed NATIVE_TOKEN <-> ERC20 mappings — only CCIP supports this

Test plan

• All 7 REVTempoSecurity tests pass
• All 19 existing tests pass (no regressions)
• Verify sucker deployer configuration works with Tempo testnet

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