Cross-harness context-compaction provenance (kind v1.2.0)#108

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benbaarber wants to merge 24 commits into

ben/derive-dedupfrom

Commits on Jul 1, 2026

fix(derive): resolve duplicate step ids so paths keep unique ids
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docs(formats): document harness compaction + capture real compaction fixtures
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feat(convo): enforce unique step ids in derive_path (keep-first)
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refactor(convo): unify turns/events into ConversationView.items
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feat(convo): emit conversation.compact steps for compaction boundaries
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feat(providers): populate Item::Compaction from each harness marker
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feat(kind): add agent-coding-session v1.1.0 with conversation.compact
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chore: version bumps for conversation-items + compaction feature
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feat(providers): project Item::Compaction back to harness markers
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fix(convo): error on duplicate step ids instead of silently dropping them
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docs(changelog): correct uniqueness behavior to error, not keep-first
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feat(compaction): model kept as surviving turn-ids for cross-harness fidelity
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fix(derive): map Claude's <synthetic> model sentinel to tool:<provider>
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test(matrix): check compaction survival as a cross-harness invariant
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refactor(claude): stop re-emitting kept turns on projection
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fix(cursor): reconcile with the items/compaction API after rebase
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docs(cursor): document /summarize compaction; treat it like gemini
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fix: reconcile compaction items IR with main's token-usage accounting
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fix(opencode): pair each compaction with its own summary, not a session-global one
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docs(formats): note compaction projection coercions for pi and opencode
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docs(test): correct stale compaction_roundtrip header
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feat(convo): resolve duplicate step ids in derive_path instead of erroring
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fix(compaction): resolve five round-trip provenance bugs found in review
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feat(derive): splice events/compactions onto the head's ancestry
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