fix(agent): support Sonnet 5 output limits (#212)

## Why

Claude Sonnet 5 was added to the product catalog while
`@ai-sdk/anthropic` remained on 3.0.84, which does not recognize that
model ID. The provider therefore applied its unknown-model 4,096-token
compatibility limit. Sonnet 5 defaults to adaptive thinking, so long
structured tool calls could be truncated before required fields such as
file content were emitted.

## Decision

Upgrade only `@ai-sdk/anthropic` within its existing 3.x major to
3.0.107. This version recognizes `claude-sonnet-5`, uses its documented
128K output capability, forwards current thinking controls, and remains
compatible with the existing AI SDK 6 and Mastra 1 stack. No retry,
prompt, schema, or runtime workaround is introduced.

## Architecture and migration effects

- No architecture boundary changes
- No database or migration changes
- Lockfile-only transitive updates under the Anthropic provider

## Verification

- `pnpm lint`
- `pnpm typecheck`
- `pnpm turbo build --force`
- `pnpm deadcode`
- `pnpm architecture:check`
- `pnpm turbo skills:build`
- Focused typechecks for `@cheatcode/agent-core` and
`@cheatcode/agent-worker`
- Captured the generated Sonnet 5 request with a mock transport and
verified `model: claude-sonnet-5` and `max_tokens: 128000`

Production flow QA will follow deployment.

Author: iamjr15

pnpm-lock.yaml

@@ -82,7 +82,7 @@ peerDependencyRules:
     '@ai-sdk/ui-utils@1.2.11>zod': '^4.0.0'
 
 catalog:
-  '@ai-sdk/anthropic': 3.0.84
+  '@ai-sdk/anthropic': 3.0.107
   '@ai-sdk/deepseek': 2.0.39
   '@ai-sdk/openai': 3.0.71
   '@ai-sdk/react': 3.0.207