yoi/.yoi/tickets/00001KX6BPY7M/thread.md

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<!-- event: create author: "yoi ticket" at: 2026-07-10T15:53:02Z -->
## 作成
LocalTicketBackend によって作成されました。
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<!-- event: decision author: hare at: 2026-07-10T15:54:24Z -->
## Decision
Worker / Session / workdir retention discussion from Objective 00001KWW44EXK:
- Worker is the archival unit; Session/transcript belongs under Worker archive.
- Worker retention must support pinned to protect selected history from cleanup/prune.
- Workdir files are cache when clean and reconstructable from repository + selector/resolved commit.
- Dirty workdir is an active/recovery state; dirty orphan should require recovery Worker or explicit discard, not automatic prune.
- Backend should keep canonical Worker/Workdir/link records in SQLite, while Runtime owns materialized files, raw paths, process/cwd binding, and cleanup execution.
- Runtime direct/unmanaged workdirs must be distinguishable from Backend-managed workdirs.
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