Pin Solana dependencies to exact versions

[venables]

Summary

• Pins @solana-program/system, @solana-program/token, and @solana/kit in demos/payments to exact versions, matching the repo's save-exact=true policy in .npmrc
• All other non-peer dependencies were already exact (via catalog or literal versions)

Test plan

• pnpm install succeeds
• pnpm run check passes

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated dependencies in the payments demo to specific versions for consistency.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1b459370-5fb9-44d0-99ac-db4f2b3dcfb2

📥 Commits

Reviewing files that changed from the base of the PR and between 6f65936 and 66fdd59.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (1)

• demos/payments/package.json

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Walkthrough

Updated Solana-related dependency versions in demos/payments/package.json by converting caret version ranges to fixed versions: @solana-program/system to 0.9.1, @solana-program/token to 0.6.0, and @solana/kit to 4.0.0.

Changes

Cohort / File(s)	Summary
Dependency Version Pinning demos/payments/package.json	Converted three Solana-related dependencies from caret ranges to fixed versions. @solana-program/system updated to 0.9.1, while @solana-program/token and @solana/kit locked to 0.6.0 and 4.0.0 respectively.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Pin Solana dependencies to exact versions' directly and clearly summarizes the main change: converting caret ranges to exact versions for Solana-related packages.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch venables/locked-versions

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