fix(signers): rename test suite from Ethereum to Bitcoin signing

[jack-dev-crypto]

Summary by CodeRabbit

• Tests
  • Updated test suite documentation to reflect correct module context. No functional changes to test behavior or execution.

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[coderabbitai]

Walkthrough

A test suite description in the Bitcoin signing test file is updated from "Ethereum signing" to "Bitcoin signing". No functional changes to test logic or implementation.

Changes

Cohort / File(s)	Change Summary
Test Suite Label packages/signers/bitcoin/tests/sign.test.ts	Test suite description corrected from "Ethereum signing" to "Bitcoin signing" for clarity and consistency with actual test purpose

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 accurately describes the main change: renaming a test suite description from 'Ethereum signing' to 'Bitcoin signing' in the bitcoin signing test file.
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 docstrings

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