[geroldsteiner67]

Summary

• Make modal node inspect block <INDEX> consume the documented second positional argument.
• Reject unknown inspect commands and invalid arguments before opening the datastore.
• Add regression tests for the CLI positional parse and invalid commands.

Validation

• cargo test -p modality-cli-node inspect_command_tests (2 passed)
• cargo check -p modality-cli-node
• cargo clippy -p modality-cli-node -- -D warnings -A clippy::too_many_arguments
• RUSTFLAGS="-D warnings" cargo check --all
• RUSTFLAGS="-D warnings" cargo check --all --tests --examples
• cargo clippy --all -- -D warnings -A clippy::too_many_arguments