feat(cli): add --dry-run flag to preview commit message without commi…

[syedahmedkhaderi]

Closes #29

What changed

Added --dry-run as a new CLI option in bin/smartcommit.ts.

When passed, gitbun --dry-run runs the full staged-file analysis and
commit message generation pipeline exactly as normal — including optional
AI enhancement if --ai is also passed — but stops before the interactive
prompt. It prints the generated message to stdout and exits with code 0
without touching git.

The dryRun option is handled in src/index.ts as an early-exit check
immediately after message generation, so it cleanly bypasses both the
confirmation flow and the git commit call.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f67983ee-a848-42f7-8427-76d2bc8a721d

📥 Commits

Reviewing files that changed from the base of the PR and between 158f38f and 9640dc5.

📒 Files selected for processing (2)

• bin/smartcommit.ts
• src/index.ts

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💥 Parsing errors (1)

Validation error: Invalid enum value. Expected 'chill' | 'assertive', received 'professional' at "reviews.profile"

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[github-actions]

🎉 This PR is included in version 1.9.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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