fix(cli): add trailing newline to --help output

[SpencerJung]

Fixes #28606. Adds missing trailing newline to CLI --help output so the shell prompt appears on a new line.

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Potential Duplicate PRs Found

Based on the search results, there are several related PRs addressing the same issue:

1. PR fix(cli): add trailing newline to --help output #29284 - fix(cli): add trailing newline to --help output

   • Appears to be an exact duplicate (same title as current PR fix(cli): add trailing newline to --help output #29368)

2. PR fix(cli): add newline to help output #28622 - fix(cli): add newline to help output

   • Very similar fix for adding newline to help output

3. PR fix(opencode): ensure help output ends with newline #28643 - fix(opencode): ensure help output ends with newline

   • Related fix for the same issue

4. PR fix: add trailing newline to help output #26374 - fix: add trailing newline to help output

   • Earlier attempt at the same fix

These PRs all address the core issue of ensuring the CLI help output ends with a trailing newline so the shell prompt appears on a new line. PR #29284 appears to be the most direct duplicate with an identical title to PR #29368. You should verify the status of these other PRs (merged, closed, or still open) to determine if #29368 is truly needed or if one of the existing PRs already resolves this issue.

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