fix: widen better-auth peer dependency to >=1.4.9 <1.5.0

[ramonclaudio]

Summary

• Widens better-auth peer dependency from exact 1.4.9 to >=1.4.9 <1.5.0, covering v1.4.9 through v1.4.18
• All imports use stable better-auth submodule paths verified compatible across the entire 1.4.x range
• Excludes 1.5.0 which removes createAuthEndpoint/createAuthMiddleware from better-auth/plugins (moved to better-auth/api), removes the better-auth/adapters/test export path, and deletes runAdapterTest entirely

Closes #232

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[coderabbitai]

📝 Walkthrough

Walkthrough

The peer dependency constraint for better-auth in package.json was updated from a fixed version "1.4.9" to a version range ">=1.4.9 <1.5.0", allowing compatible minor patch versions while maintaining backward compatibility.

Changes

Cohort / File(s)	Summary
Dependency Version Constraint package.json	Updated peer dependency for better-auth from fixed version 1.4.9 to range >=1.4.9 <1.5.0, enabling use of compatible patch releases.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A version range, oh what delight,
No longer pinned to a single height,
Now patches flow freely through the gate,
Updates arrive—no need to wait!
From 1.4.9, the bugs take flight. ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR partially addresses issue #232's objective to remove the exact pin on better-auth, but uses a narrower range (>=1.4.9 <1.5.0) than the issue's implied preference (^1.4.9) and PR objectives mention (^1.4.9).	Consider aligning the version constraint with the broader ^1.4.9 range mentioned in PR objectives, or clarify why the narrower <1.5.0 upper bound is necessary for compatibility.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: widening the better-auth peer dependency version constraint from a fixed version to a range.
Out of Scope Changes check	✅ Passed	The PR only modifies package.json peer dependency specification, which is directly in scope for addressing issue #232's request to widen the version constraint.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[frailbongat]

Hoping this can be merged soon, we’re blocked on better-auth 1.4.11 support in our project. Thanks for the work on this.