weichenandCursor 6bc1b08540 Record sessions as an append-only entry tree ...

Why: Linear transcripts cannot fork, and compaction rewrote history, so resume and branch navigation had nothing to point at.
Evidence: go test -count=1 ./runtime/session/
Impact: Load still returns the model-visible path, including old one-message-per-line files. Compaction appends a summary entry instead of truncating the file.
Refs: feature/pi-headless N1
Co-authored-by: Cursor <cursoragent@cursor.com>

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..

catalog.go

Record sessions as an append-only entry tree

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compact_test.go

Record sessions as an append-only entry tree

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compact.go

Record sessions as an append-only entry tree

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html.go

Record sessions as an append-only entry tree

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jsonl_test.go

Import the current agent-native module as a fresh history.

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jsonl.go

Record sessions as an append-only entry tree

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tree_test.go

Record sessions as an append-only entry tree

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tree.go

Record sessions as an append-only entry tree

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