fix(cli): remove calldata_id resolution — tx_ready delivers calldata directly

[neavra]

Summary

Removes all calldata_id client-side resolution from the SDK CLI. Calldata is now delivered via tx_ready SSE events with full hex — the client no longer needs to fetch calldata references from the agent-backend API.

What changed

executor.ts:

• Removed backendClient field and setBackendClient() method
• Removed calldata_id resolution in buildTx (the if (params.calldata_id && !params.data) block)
• Removed raw calldata pass-through in buildTx (the if (params.data || params.calldata || params.hex_payload) block) — server-built calldata arrives via tx_ready, not via action params
• Replaced silent fallback to buildSendTx with an explicit error throw
• buildTx now only handles ABI-encoding from function_name + contract_address

client.ts:

• Removed getCalldata() HTTP method (called GET /agent/calldata/:id)

session.ts:

• Removed setBackendClient wiring after auth

Why

Both Sonnet and minimax were observed putting the literal string calldata_id: cd_xxx into the tx data field, causing on-chain reverts. The calldata_id mechanism required the LLM to correctly place a machine-generated reference into the right tool parameter — a fundamentally fragile design.

The companion agent-backend PR (#109) moves calldata stashing after tx_ready emission, so tx_ready always carries full calldata. Clients sign directly from tx_ready without needing calldata_id resolution.

Depends on

• vultisig/agent-backend#109 must deploy first — it ensures tx_ready carries full calldata instead of calldata_id references

Test plan

• yarn check passes
• Swap ETH → USDC lands on-chain (tx_ready flow, no calldata_id)
• Pendle buy/sell PT lands on-chain (calldata_id flows through build_evm_tx on agent-backend side, never reaches SDK CLI)
• Simple send still works (no regression)

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