Add network id to stellar network info.

[fnando]

What

$ stellar network info --output json
{"id":"baefd734b8d3e48472cff83912375fedbc7573701912fe308af730180f97d74a","version":"25.0.0","commit_hash":"9fc81d81a4680932f2a94a641613ef1546be206c","build_timestamp":"2026-01-08T23:18:11","captive_core_version":"v25.1.1","protocol_version":25,"passphrase":"Standalone Network ; February 2017","friendbot_url":"http://localhost:8000/friendbot"}

$ stellar network info --output json-formatted
{
  "id": "baefd734b8d3e48472cff83912375fedbc7573701912fe308af730180f97d74a",
  "version": "25.0.0",
  "commit_hash": "9fc81d81a4680932f2a94a641613ef1546be206c",
  "build_timestamp": "2026-01-08T23:18:11",
  "captive_core_version": "v25.1.1",
  "protocol_version": 25,
  "passphrase": "Standalone Network ; February 2017",
  "friendbot_url": "http://localhost:8000/friendbot"
}

$ stellar network info
ℹ️ Network Id: baefd734b8d3e48472cff83912375fedbc7573701912fe308af730180f97d74a
ℹ️ Version: 25.0.0
ℹ️ Commit Hash: 9fc81d81a4680932f2a94a641613ef1546be206c
ℹ️ Build Timestamp: 2026-01-08T23:18:11
ℹ️ Captive Core Version: v25.1.1
ℹ️ Protocol Version: 25
ℹ️ Passphrase: Standalone Network ; February 2017
ℹ️ Friendbot Url: http://localhost:8000/friendbot

Why

Close #2390.

Known limitations

N/A

[Copilot]

Pull request overview

Adds the computed Stellar network ID (SHA-256 of the network passphrase) to the stellar network info output, addressing the need from #2390 for easily obtaining the network ID via the CLI.

Changes:

• Compute id as sha256(passphrase) and include it in network info text + JSON/JSON-formatted outputs.
• Extend the network info integration tests to assert that id is present in both text and JSON outputs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
cmd/soroban-cli/src/commands/network/info.rs	Computes and prints/serializes id alongside existing network/version info.
cmd/crates/soroban-test/tests/it/integration/network.rs	Adds integration tests ensuring network info includes the new id field.