fix(opencode): correct Bedrock Luna token usage - #47354
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Issue for this PR
Closes #47296
Type of change
What does this PR do?
Bedrock's GPT-5.6 Luna response already includes cached tokens in the input count. The AI SDK adds the cache read/write fields again while normalizing it, so OpenCode was storing roughly twice the real context usage and compacting after each message.
This removes that extra cache amount before OpenCode splits cached and non-cached input. The workaround is limited to the Bedrock Luna model; other Bedrock and Anthropic models keep the existing path.
How did you verify your code works?
Added a regression case with the numbers from the issue. It now records 152,050 total tokens instead of 303,459 and stays below the compaction limit.
bun test test/session/compaction.test.tsbun typecheckScreenshots / recordings
Not applicable.
Checklist