Migrate transaction-building to evm-actions-api (v0.1.0)

[ungaro]

Summary

Makes nest the canonical Plume CLI for both human (private-key broadcast) and agentic (--dry-run -o json + --address) use by moving transaction-building onto the evm-actions-api HTTP service.

• Route same-chain deposit/withdraw through mint/build-tx and redeem/build-tx; keep cross-chain boring deposit-and-bridge built locally behind --bridge.
• Add EvmActionsClient (retry-once on 5xx, clean 4xx {error} surfacing) alongside the untouched NestApiClient.
• New commands: bridge (local LayerZero OFT send), claim {pending,submit}, instant-redeem {quote,liquidity,submit}, update-redeem {pending,submit}, auto-claim {status,enable,disable}.
• Introduce the TxBundle stable JSON contract (decimal value, per-route label set, extra passthrough) for agentic signing; drop the private-key requirement for dry-runs (use --address).
• Remove dead client-side encoding (predicate-message building, AtomicQueue, UnsignedTx); cargo clippy --all-targets -- -D warnings clean.
• Fixes found en route: self-update no longer panics inside the async runtime (every invocation used to crash); support the boringNest vault type the API returns for nest-treasury-vault.
• Bump to v0.1.0; rewrite README; add design spec + implementation plan.

New env var: EVM_ACTIONS_API_BASE (default https://api-dev-test.nest.credit/v1/actions). Chains served by the API are pinned in ACTIONS_API_CHAINS (1, 56, 9745, 42161, 98866; no Worldchain).

Test Plan

• cargo test (19 unit/wiremock tests), cargo clippy --all-targets -- -D warnings, cargo build --release — all green
• Live plumbing verified against the dev API: nest-treasury-vault (boringNest) parses, decimals resolve, requests reach the API, 4xx errors surface cleanly
• Run with a Predicate-compliant address + a real ETHEREUM_RPC_URL to confirm happy-path output:
  • deposit --vault nest-treasury-vault --asset 0x55d3…(USDT) --amount 1 --chain bsc --address <you> --dry-run -o json → 2-tx bundle, shareDecimals: 18
  • deposit --vault nest-elixir-vault --asset 0xa0b8…(USDC) --amount 1 --chain ethereum --address <you> --dry-run -o json → 2-tx boring bundle, shareDecimals: 6
  • bridge --vault nest-treasury-vault --shares 0.1 --from-chain ethereum --to-chain plume --address <you> --dry-run -o json → 1-tx send bundle, non-zero value
  • claim pending --vault nest-treasury-vault --redemption-asset <valid plume asset> --user <you> --chain plume -o json → claimable-shares structure

Release: tag v0.1.0 after merge to build the three platform tarballs (aarch64-darwin, x86_64-darwin, x86_64-linux-gnu).