refactor(interfaces): IERC4626Minimal inherits IERC20MetadataMinimal, eliminating redundant decimals()

[thedavidmeister]

Summary

• IERC4626Minimal previously declared decimals() directly, duplicating the same signature already in IERC20MetadataMinimal
• Now IERC4626Minimal is IERC20MetadataMinimal, so decimals() is declared exactly once, reflecting that every ERC-4626 vault is also an ERC-20 token
• No logic change: vault.decimals() and IERC20MetadataMinimal(vault.asset()).decimals() both work as before
• Interface declarations reordered: IERC20MetadataMinimal first (the base), then IERC4626Minimal is IERC20MetadataMinimal

Closes #78

Test plan

• forge test — 123 tests passed, 0 failed, 0 skipped

Co-Authored-By: Claude noreply@anthropic.com

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0ad835e9-c3d4-4bbe-9e9c-e404851dd60d

📥 Commits

Reviewing files that changed from the base of the PR and between 7415942 and 330360f.

📒 Files selected for processing (1)

• src/lib/erc4626/LibERC4626.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-78-ierc20metadata-leaky

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