feat(tools): cap mention attachment expansion

[martian56]

Fixes #169.

Summary:

• Add a total character budget for file mention attachments.
• Add a maximum attached-file count for one prompt.
• Add an omitted-files notice that tells the model to use read_file when more content is needed.
• Keep normal single-file mention expansion unchanged.
• Bump the patch version and update the changelog.

Checks:

• rvpm test
• rvpm build
• rvpm fmt --check

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 89221626-deca-4d74-b275-cdee8972e2de

📥 Commits

Reviewing files that changed from the base of the PR and between fd23b86 and 0641b4c.

📒 Files selected for processing (4)

• CHANGELOG.md
• rv.toml
• src/tools/mentions.rv
• src/tools/mentions_test.rv

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat-mention-attachment-budget

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