fix: update HTTP status code for FailedPrecondition to 400

[yordis]

No description provided.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Updated the HTTP status mapping for FailedPrecondition from 422 to 400 across implementation, tests, and documentation. No function signatures or control flow changed.

Changes

Cohort / File(s)	Summary
Docs doc.go	Revised documentation to state FailedPrecondition maps to HTTP 400 instead of 422.
Error mapping implementation error.go	In HttpStatusCode(), changed CodeFailedPrecondition mapping from 422 to 400; other mappings unchanged.
Tests error_test.go	Updated TestHTTPCodesMatchADR table to expect 400 for FAILED_PRECONDITION.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I twitch my nose at status lore,
From 422 to 400’s door—
Precondition paths now clean and neat,
A tidy hop on careful feet.
Thump-thump! The tests agree,
Docs in sync—so let it be. 🐇

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📥 Commits

Reviewing files that changed from the base of the PR and between 28fae9f and 0f63719.

📒 Files selected for processing (3)

• doc.go (1 hunks)
• error.go (1 hunks)
• error_test.go (1 hunks)

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