fix(opencode): allow none reasoning effort in Bedrock SDK

[rekram1-node]

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Extend the existing @ai-sdk/amazon-bedrock@4.0.166 dependency patch to accept none in reasoningConfig.maxReasoningEffort.

The SDK's effort enum currently rejects none before making an AWS request, even though GPT-5.6 supports it. Its existing serializer already maps the effort to additionalModelRequestFields.reasoning.effort for GPT models. Add the missing enum value in both ESM and CommonJS runtime bundles and their TypeScript declarations; no serializer changes are needed.

The previous OpenCode transform workaround is removed. src/provider/transform.ts is identical to the PR base. Preserve the existing Anthropic block-binding patch; leave variant generation, defaults, summary settings, Mantle, and configuration merging unchanged. No package-version, lockfile, or catalog changes. As with the SDK's other effort values, adding a value to its shared schema does not assert that every Bedrock model supports it.

AWS documents none as a supported GPT-5.6 effort, so removing it from models.dev would incorrectly narrow the model's capabilities: https://aws.amazon.com/blogs/machine-learning/get-started-with-openai-gpt-5-6-sol-terra-and-luna-on-amazon-bedrock/

How did you verify your code works?

• One parameterized regression in the existing transform test file checks the unchanged maxReasoningEffort: "none" variant against the SDK's public TypeScript type and exercises actual SDK request serialization for global Luna, Sol, and Terra. It also checks the other five variant mappings remain unchanged.
• With the transform workaround removed, all three regression cases failed before the SDK patch with invalid bedrock provider options; all passed afterward.
• Separate ESM and CommonJS probes confirmed the existing serializer emits additionalModelRequestFields.reasoning.effort: "none".
• bun test test/provider --timeout 30000 --only-failures: 589 passed, 0 failed.
• packages/core: bun test test/plugin --timeout 30000 --only-failures: 227 passed, 0 failed.
• Nine live source-CLI checks in us-east-1 passed: all six efforts for global Luna, none for global Sol and Terra, and none for Mantle Luna. Each returned OK, completed normally, and emitted no error events. Checks used isolated configuration/data and disabled tools; the temporary live harness is not part of the PR.
• bun typecheck in packages/opencode and packages/core: passed.
• bun install --frozen-lockfile: passed with the updated patch, without lockfile changes.
• Prettier and git diff --check: passed.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR