fix(test): repair trix test expect/balance phase + modernize utxorpc utxo parsing

[scarmuega]

What

trix test resolves and submits the scaffolded transfers fine, but its expect/balance phase never worked against the released cshell — it errored with CShell failed to get wallet utxos and, on that error path, leaked the Dolos devnet daemon. Reproduces on both stable (trix 0.25.1) and beta (0.26.0), with cshell 0.14 / utxorpc 0.13.

It turned out to be four layered bugs, each only visible once the prior is fixed:

1. @-prefix not stripped — the expect path passed the literal @bob placeholder to cshell wallet utxos, but wallets are named bob. The tx path already strips it (replace_placeholder_args); the expect path now mirrors that via a small, unit-tested wallet_name helper.
2. Wrong cshell store — expect queried devnet.home (the dolos store), which holds neither the wallets nor the provider. It now queries wallet.target_dir — the same cshell home the invoke path submits against.
3. Missing provider — cshell wallet utxos <NAME> <PROVIDER> falls back to the default provider when the positional is omitted, but the generated cshell.toml marks its sole provider is_default = false. Expect now passes the provider name explicitly (same as invoke), fixing Wallet and provider not found.
4. Stale utxo deserialization — cshell emits utxorpc AnyUtxoData via pbjson (camelCase keys, bytes as base64, the parsed_state oneof flattened to cardano, BigInt coin as { "int": "..." }), but the UTxO struct expected a flat hex shape and failed with missing field tx.

Also: tear the devnet down unconditionally so a failed/early-exiting test never leaves a daemon running, and surface cshell's stderr in the utxos error.

Two commits

• fix(test): … — fixes bugs 1–3 + the daemon leak, and (bug 4) replaces the stale UTxO deserializer. This commit couldn't reuse trix's own utxorpc types: the pinned spec (0.17) modeled cardano coin as plain uint64, which won't parse cshell's BigInt-shaped coin — so it landed a self-contained wire deserializer.
• refactor(test): deserialize cshell utxos via utxorpc AnyUtxoData — bumps utxorpc 0.12 → 0.13 (matching cshell, spec 0.18, which models coin as BigInt) and deserializes straight into utxorpc::spec::query::AnyUtxoData. pbjson handles the camelCase / base64 / oneof / BigInt shaping, so the hand-rolled wire structs, the base64 decode helper, and the direct base64 dep all go away (net −63 lines). The bump is otherwise transparent — the only other utxorpc consumer, devnet/copy.rs, compiles unchanged.

Testing

• New unit tests for the @-strip; full lib suite (55) green; clippy clean.
• Verified end-to-end against the installed beta channel via the umbrella DX e2e harness (e2e/, journey 01-basic-init) after both commits: trix test on the default scaffold prints Test Passed, and no Dolos daemon survives the run.

Surfaced by the umbrella DX e2e harness (tx3-lang/toolchain e2e/), which had this round-trip bracketed as an xfail on exactly this signature.

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