chore: increase mint cache robustness

[ananas-block]

Summary by CodeRabbit

Bug Fixes

• Enhanced validation for token compression operations with improved error detection when cache data is unavailable
• Strengthened error handling and diagnostic messaging to provide clearer feedback during compression workflows

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request adds a new error variant MintNotInCache to the error code enum and implements validation to enforce that the mint extension exists in the cache, returning the error if the mint is missing instead of handling a None value.

Changes

Cohort / File(s)	Summary
Error Definition programs/compressed-token/anchor/src/lib.rs	Added new error variant MintNotInCache (code 6172) with diagnostic message indicating a missing mint in cache, representing an internal error condition.
Cache Validation programs/compressed-token/program/src/compressed_token/transfer2/compression/mod.rs	Added validation to enforce mint extension exists in cache; replaced Optional mint_checks handling with concrete value via error return; adjusted downstream call to pass Some(mint_checks) and simplified is_restricted derivation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• fix: cmint instruction data & cleanup #2164: Directly modifies the same compression/mod.rs file with overlapping changes to mint-extension cache logic and validation handling.

Suggested labels

ai-review

Suggested reviewers

• sergeytimoshin
• SwenSchaeferjohann

Poem

A mint slipped through the cache's door,
Now errors catch what's lost before—
With code 6172, we stand our ground,
No ghosts in cache when we're around! 🏦✨

🚥 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 'chore: increase mint cache robustness' accurately reflects the main change: adding a MintNotInCache error and enforcing mint existence checks in the cache.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 70.00%.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch jorrit/chore-increase-mint-check-robustness

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