feat: session compaction#21
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Adds a heuristic token estimator (byte-length / 4) used by session compaction to detect when token usage approaches the context window limit. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…action Add session compaction support: Compact() replaces old messages with a summary while keeping the most recent N messages. History() now prepends the active summary message when present, and Clear() resets all compaction state. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add compact record type to the JSONL format so that compaction summary and version survive across Save/Load cycles. On rewrite, a "compact" record is emitted between the metadata line and the kept messages. On Load, encountering a compact record resets the message accumulator and restores summaryMsg/compactVersion on the session. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add ContextBudget and ReserveTokens fields to SessionConfig for controlling the token-based compaction threshold. Add compaction prompt constants (preFlushPrompt, summaryPrompt, flushSkipSentinel) that will be used by the agent compaction orchestrator. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…anagement Wire contextBudget/reserveTokens config into Agent struct, create the compaction pipeline (pre-flush, summarize, compact), and hook it into runLoop before appending the user message. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
End-to-end tests covering the full session lifecycle: create, populate, compact, save, load, verify, append, save again, and verify persistence of summary and message counts across reloads. Also tests token estimation threshold detection for compaction triggering. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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