Add list subcommand for manifest accounts

[pullfrog]

closes #391

What changed

• added a new list subcommand to print account names from manifest.json
• wired the command into clap subcommands and runtime dispatch
• added unit tests for list extraction behavior and kept CLI shape validation covered by existing verify_cli test

Notes

• list now runs before auto-upgrade logic so it does not mutate manifest/account files
• if the manifest requires migration, list exits with a clear error instead of modifying data

Testing

• cargo test list::tests::
• cargo test commands::tests::verify_cli
• cargo fmt --check

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[dyc3]

@pullfrog fix ci

[pullfrog]

Identified the CI failure in the Clippy step as clippy::useless_vec in src/commands/list.rs test code, introduced by this PR. Replaced the unnecessary vec![] with an array literal in account_names_preserves_manifest_order, then re-ran the exact CI command cargo clippy --workspace --no-deps --all-features --all-targets -- -D warnings successfully. Pushed commit ce7dd10 to pullfrog/0-add-list-subcommand.

Task list (5/5 completed)

• Checkout PR Add list subcommand for manifest accounts #494 branch locally
• Retrieve CI check suite logs and identify failing command
• Confirm failure is introduced by this PR
• Implement fix and rerun exact CI command locally
• Commit fix, push branch, and report progress

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