SW-095 — Add unknown-option remediation copy tests

[dDevAhmed]

Summary

Test unknown-option UX for root and representative subcommands.

Acceptance Criteria

• unknown options fail consistently;
• help/remediation is concise;
• command semantics remain unchanged;
• repository checks pass.

Dependencies

• SW-008

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🏷 Labels

• Stellar Wave
• type: ux
• area: cli-core
• priority: P2
• difficulty: low
• points: 100
• workstream: cli-core