feat(compaction): reuse prompt caches during compaction - #103
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Manual /compact previously sent a fresh request with a dedicated system prompt and no tools, so provider prompt caches (KV cache) were missed and the entire history was reprocessed. Send the same system prompt, history, and tool registry as a regular turn, with the compaction instruction appended as the final user message, keeping the request prefix cacheable. Tool calls are rejected with DisableToolCalls while the prompt asks the model to work from the existing history alone. The applied summary now uses only the final assistant text run so pre-tool preamble cannot replace the conversation, and incomplete streams route through the compaction failure path so the UI cannot get stuck mid-compaction.
1.05M context via API, 272K on Codex OAuth; efforts low-max.
Preserve the normal request prefix and tool definitions for automatic compaction while preventing tool execution and recursive compaction. Keep provider cache controls enabled for isolated one-shot requests.
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Summary
Testing
go test ./...go vet ./...git diff --check origin/main...HEADCloses #97