chore(opencode): pin google providers before tool id regression

[rekram1-node]

Summary

• set @ai-sdk/google to 3.0.73, retaining the no-argument tool-call thoughtSignature fix introduced in 3.0.71
• set @ai-sdk/google-vertex to 4.0.128, which resolves @ai-sdk/google@3.0.73 instead of the 3.0.74+ serializer that emits unsupported tool-call IDs on Vertex v1 paths
• remove the mixed state on dev, where direct Google was 3.0.63 but Vertex still pulled @ai-sdk/google@3.0.75

Regression

@ai-sdk/google@3.0.74+ serializes functionCall.id and functionResponse.id. Vertex v1 / Express-mode and the observed GCP-routed Gemini endpoint reject these fields with Unknown name "id", breaking tool continuations. This is an upstream serializer regression exposed by supported provider paths, not a user configuration error.

Validation

• bun install --ignore-scripts
• packages/core: bun typecheck && bun test "test/plugin/provider-google.test.ts" "test/plugin/provider-google-vertex.test.ts" (11 pass)
• packages/opencode: bun typecheck && bun test "test/provider/transform.test.ts" (224 pass)
• packages/llm: bun typecheck && bun test "test/provider/gemini.test.ts" (11 pass)