fix(invoke): exit non-zero when cshell resolve fails

[scarmuega]

Problem

trix invoke swallows a failed resolve. tx_invoke_interactive (src/spawn/cshell.rs) runs cshell via .output() but never checks the exit status, so when cshell fails — e.g. a TRP resolve error like ❗️ error: target type not supported: Custom(...) — the message is printed to the inherited stderr but the function still returns Ok(()), and trix invoke exits 0. Callers and CI can't detect the failure by exit code.

Fix

Capture the command output and bail on a non-success status, exactly as the sibling tx_invoke_json already does:

if !output.status.success() {
    bail!("CShell failed to execute transaction");
}

The error then propagates wallet.invoke_interactive → commands/invoke.rs → main() -> Result<()>, so the process exits non-zero. A successful --skip-submit invoke still exits 0 and prints {hash, cbor} as before.

Testing

cargo build, cargo clippy, and cargo test all pass (21 tests).

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