Greptile Summary

This PR fixes two gaps in the bundled NVIDIA/NIM provider catalog: it persists the NVIDIA_API_KEY marker in the generated ModelProviderConfig (previously omitted because buildManifestModelProviderConfig never emitted apiKey), and marks all four bundled NIM models with compat.requiresStringContent: true so OpenAI-compatible subagent calls send plain-text content. Both changes are covered by new assertions in the provider-catalog test.

Confidence Score: 5/5

This PR is safe to merge — both fixes are targeted, consistent with codebase patterns, and covered by new regression tests.

No logic errors, security issues, or missing edge cases found. The apiKey marker value matches what the existing nvidia auth tests expect. The requiresStringContent flag is a valid field in ModelCompatConfig, and buildManifestCatalogModel already handles compat propagation. The spread ordering is correct since buildManifestModelProviderConfig never emits apiKey.

No files require special attention.

_{Reviews (1): Last reviewed commit: "fix(nvidia): align NIM provider metadata" | Re-trigger Greptile}