Return retryable error for auto-routing selection failures

[chrarnoldus]

Summary

• describe the failure as an auto-routing selection problem instead of blaming organization model restrictions
• return HTTP 503 so clients can treat the failed routing decision as transient and retryable
• align routing comments and focused test expectations with the new behavior

Testing

• Local tests were not run, as requested; CI handles validation.
• git diff --check passed.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/web/src/lib/ai-gateway/llm-proxy-helpers.ts
• apps/web/src/app/api/openrouter/[...path]/route.test.ts

Previous Review Summaries (2 snapshots, latest commit 9b47d94)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 9b47d94)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 file)

• apps/web/src/app/api/openrouter/[...path]/route.test.ts

Previous review (commit c642eed)

Status: 1 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
apps/web/src/lib/ai-gateway/llm-proxy-helpers.ts	332	Tests still assert the old error copy

Files Reviewed (2 files)

• apps/web/src/lib/ai-gateway/llm-proxy-helpers.ts - 1 issue
• apps/web/src/app/api/openrouter/[...path]/route.ts - 0 issues

Fix these issues in Kilo Cloud

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_{Reviewed by grok-4.6 · Input: 77.1K · Output: 7.7K · Cached: 295.2K}

_{Review guidance: REVIEW.md from base branch main}