[codex] add multisig relay handling

[gakonst]

What changed

Adds native multisig support to Handler.relay behind a new multisig option.

• Intercepts native multisig eth_sendRawTransaction and eth_sendRawTransactionSync submissions.
• Collects owner approvals in the configured store and broadcasts once owner weight reaches threshold.
• Uses the canonical native multisig operation id from MultisigConfig.getSignPayload while quorum is pending.
• Resolves that operation id through standard eth_getTransactionByHash and eth_getTransactionReceipt polling. Pending receipts return null; after quorum the relay proxies to the real submitted hash and clears the alias once a receipt exists.
• Validates resolveConfig output against the multisig account and genesis config id, and reuses the stored bootstrap config for later approvals that omit init.
• Handles Tempo fee-payer handoff envelopes (0x78) using viem/ox constants instead of hardcoded transaction prefixes.
• Composes with feePayer: finalized multisig transactions can be fee-payer signed at quorum, including sponsor/default fee-token preservation.
• Supports local native Tempo binaries in VITE_NODE_TAG for localnet testing while preserving Docker tag/HTTP URL support.

Validation

• pnpm check
• pnpm exec tsc -b --noEmit
• pnpm test src/core/Client.test.ts src/server/internal/handlers/relay.test.ts
• VITE_NODE_TAG=/Users/georgios/github/tempoxyz/tempo/target/debug/tempo VITE_RPC_PORT=18645 pnpm test src/server/internal/handlers/relay.localnet.test.ts (54 passed)

Localnet note

The Tempo Docker images tested locally (ghcr.io/tempoxyz/tempo:sha-3da8342 and latest) are amd64-only, and prool/testcontainers forces linux/x86_64. On this Apple Silicon machine they fail before RPC startup with MDBX failed to open the database: Operation not supported (95). The localnet validation above used the native Tempo PR 5178 binary at commit 3da83424774c714f1d20ffa1962a3531d0dd06d2.

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Project	Deployment	Actions	Updated (UTC)
accounts-site	Ready	Preview, Comment	Jun 7, 2026 11:26am

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npm i https://pkg.pr.new/tempoxyz/accounts@613

commit: cae54ee

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[tmm]

closing in favor of #624