fix: Binary naming for harness

[igor-susic1]

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Kimchi Summary

What changed

Aligns the development harness binary name with the main binary by renaming references from kimchi-code to kimchi throughout the update system.

Why

The kimchi-dev repository now publishes its binary as kimchi rather than kimchi-code, requiring the update client to look for the correct filename when downloading and extracting releases.

Key changes

• internal/update/github_client.go: Updated kimchiDevRepo.Binary constant from "kimchi-code" to "kimchi"
• internal/update/harness.go: Updated documentation comment to reference the correct binary name
• internal/update/extract_test.go: Modified test archive contents and assertions to expect bin/kimchi instead of bin/kimchi-code
• internal/update/harness_test.go: Updated path resolution tests and fixtures to use kimchi binary name
• internal/update/workflow_test.go: Updated test package JSON metadata to use "kimchi" as the name value

[kimchi-review]

Kimchi Code Review

Property	Value
Commit	4f5af88
Author	@igor-susic1
Files changed	0
Review status	Completed
Comments	0
Duration	15s

Summary

📊 Review Score: 98/100 (overall code quality — 0 lowest, 100 highest)
⏱️ Estimated effort to review: 1/5 (1 = trivial, 5 = very complex)

🧪 Tests: yes — All test files (extract_test.go, harness_test.go, workflow_test.go) are updated to use the new binary name kimchi instead of kimchi-code, ensuring test expectations match the implementation changes in github_client.go.

No significant issues found. LGTM! 🎉

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[kimchi-review]

📊 Review Score: 98/100 (overall code quality — 0 lowest, 100 highest)
⏱️ Estimated effort to review: 1/5 (1 = trivial, 5 = very complex)

🧪 Tests: yes — All test files (extract_test.go, harness_test.go, workflow_test.go) are updated to use the new binary name kimchi instead of kimchi-code, ensuring test expectations match the implementation changes in github_client.go.

No significant issues found. LGTM! 🎉