Summary: Enhances the Commit Composer auto-compose flow by giving the AI the original commit messages as additional context.

Changes:

• Adds a new commitMessages input to the generateCommits action and prompt template context.
• Extends the generate-commits prompt to include these messages and guidance on how to use them.
• Collects commit messages during composer initialization (in recompose scenarios) and passes them into the AI request.

Technical Notes: Messages are serialized as JSON and included only on the first conversation turn to help the model infer original intent while preserving existing commits unchanged.

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