fix(gateway): assume models with empty supported parameters support tools

[chrarnoldus]

Kilo Gateway hides models whose supported_parameters doesn't include tools, since Kilo requires tool calling. A missing list was already treated optimistically, but an empty list ([]) was treated as "no tools". Some router models on https://kilo.ai/api/openrouter/models, e.g. typesafe/jev-router, report an empty list and were therefore hidden.

This adds a shared supportsTools helper in @kilocode/kilo-gateway that treats a missing or empty supported_parameters as tool-capable, and uses it both for the gateway model list (filter + tool_call capability) and the cloud agent catalog (which previously also dropped models with a missing list).

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

The shared supportsTools helper is applied consistently to both the gateway model filter and the cloud agent catalog, matching the stated intent that a missing or empty supported_parameters list is treated optimistically as tool-capable. Behavior, tests, and the changeset line up with the PR description; no bugs, security, performance, or memory-leak concerns found in the changed lines.

Files Reviewed (6 files)

• .changeset/gateway-optimistic-tool-support.md
• packages/kilo-gateway/src/api/models.ts
• packages/kilo-gateway/src/index.ts
• packages/kilo-gateway/test/api/models.test.ts
• packages/opencode/src/kilocode/cloud/catalog.ts
• packages/opencode/test/kilocode/cloud/defaults.test.ts

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