Module compaction 

Context compaction for long sessions.

This module ports the pi-mono compaction algorithm:

• Estimate context usage and choose a cut point that keeps recent context
• Summarize the discarded portion with the LLM (iteratively updating prior summaries)
• Record a compaction session entry containing the summary and cut point
• When building provider context, the session inserts the summary before the kept region and omits older messages.

Structs

CompactionDetails

Details stored in CompactionEntry.details for cumulative file tracking.

CompactionPreparation

CompactionResult

FileOperations

ResolvedCompactionSettings

Functions

compact

compaction_details_to_value

prepare_compaction

summarize_entries