[Fix] Astra provider CI fails when focused tests are omitted

[zoomote]

​Opened on behalf of @navedmerchant. View the task or mention @roomote for follow-up asks.

What changed

• Keeps hyphen-suffixed direct tests such as openai-native-usage.spec.ts in changed-code mutation runs instead of dropping them when a dot-suffixed direct test also exists.
• Adds focused decision-table coverage for Astra reasoning normalization, Responses Lite routing, cache behavior, temperature, token fields, and sequential tool calls across the providers merged in [Feat] Add verified GPT-6 Astra support across providers #1506.
• Simplifies equivalent cache-total and exact-model predicates so mutation testing measures observable behavior rather than module-initialization artifacts.

Why this change was made

The mutation gate on #1506 omitted an existing focused usage suite and left provider guard branches under-specified. The feature was merged while the final CI remediation was still being validated, so these fixes are isolated in this follow-up.

Impact

Changed-code mutation testing now exercises all directly related focused suites and passes for the Astra provider changes. Runtime behavior from #1506 is preserved.

Related PRs

• Original implementation: [Feat] Add verified GPT-6 Astra support across providers #1506
• Documentation: [Docs] Document GPT-6 Astra provider support Zoo-Code-Docs#59

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Review status

This PR was opened by an automated account. A human maintainer must verify the change intent, provenance, and validation before merging.

Current step: Resolve the merge conflicts. The review sequence resumes after the branch is mergeable.

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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