phase 2.1-2.4: send path — submit + status, txbuilder, wallet.send, wallet.tx_status
chain backend grew submit_tx (POST /submittx, raw cbor body) and
tx_status (POST /tx_info → Confirmed{block,epoch}|NotFound). serde
tag-based status enum so the mcp tool returns clean json.
new core::tx module: ProtocolParams + InputUtxo + build_signed_payment.
two-pass fee refinement — build unsigned, measure size, add witness
overhead constant (128 bytes for vkey+sig+cbor framing), recompute
real fee, build with final fee, sign once (PrivateKey doesn't impl
Clone in pallas-wallet, so we don't double-sign). change below
min-utxo merges into fee instead of emitting dust.
added pallas-txbuilder + pallas-wallet 0.32 deps. PaymentKey gains
crate-private xprv() accessor; payment_key_to_private converts
ed25519-bip32 XPrv → pallas-wallet PrivateKey::Extended via the
64-byte extended secret bytes.
mcp tools.rs: 4 → 6 tools.
- wallet.send (to_address, lovelace, force) with hard-cap guard
- wallet.tx_status (tx_hash) → status json
SendArgs/TxStatusArgs use schemars derive so rmcp generates proper
input schemas. config.rs adds max_send_lovelace (default 100 ADA,
ALDABRA_MAX_SEND_LOVELACE env override).
37 unit tests. mcp tools/list smoke confirms all 6 tools register
with correct schemas (force defaults false, lovelace required uint64,
to_address required string).
phase 2.5 (native-asset send), 2.6 (cold-sign offline mode), and
2.7 (real preprod smoke against a funded wallet) still open.
Cobb
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