[diegosouzapw]

Summary

• reconcile stale release tests with provider behavior already merged by fix(providers): xai-oauth chat→responses translation + breaker import (#10165) #10170, fix(providers): default missing cache_control.ttl to 1h on the native Claude OAuth path #10221, and fix(api): reach DeepSeek V4's native max reasoning tier #10230
• keep the repair test-only: no production behavior changes
• clear the release/v3.8.50 unit-shard base-red reproduced while validating PR fix: repair Audio Bridge runtime multipart self-loop #10229

Root causes

1. fix(providers): xai-oauth chat→responses translation + breaker import (#10165) #10170 intentionally moved xai-oauth/grok-4.5 from Chat Completions to the Responses contract, but two older assertions still expected /chat/completions and messages.
2. fix(providers): default missing cache_control.ttl to 1h on the native Claude OAuth path #10221 intentionally defaults missing native-Claude cache_control.ttl values to 1h, but five older assertions still expected only { type: "ephemeral" }.
3. Existing provider sanitization downgrades xhigh to high for models that do not declare extra-high support, but one AIO assertion still expected xhigh.

The new feature-specific regression tests were green in every case; only the stale expectations failed.

TDD proof — Local VPS 192.168.0.15

First red/green cycle, xAI:

red:   12 tests — 10 passed, 2 failed
green: 12 tests — 12 passed, 0 failed

Second red/green cycle, Claude cache TTL and provider reasoning sanitization:

red:   94 tests — 88 passed, 6 failed
green combined suite: 106 tests — 106 passed, 0 failed

Combined VPS command:

DATA_DIR=/tmp/omniroute-base-red-green-46f0294f \
SQLITE_FILE=/tmp/omniroute-base-red-green-46f0294f/storage.sqlite \
node --import tsx/esm --test \
  tests/unit/chatcore-translation-paths.test.ts \
  tests/unit/cc-compatible-provider.test.ts \
  tests/unit/executor-xai.test.ts \
  tests/unit/executor-xai-chat-to-responses-10165.test.ts

The same three changed files passed ESLint on the VPS with the repository's official suppression baseline.

Scope

Changed files:

• tests/unit/executor-xai.test.ts
• tests/unit/chatcore-translation-paths.test.ts
• tests/unit/cc-compatible-provider.test.ts

No changelog fragment: this PR only reconciles stale tests with already documented and merged production behavior.