CodeWhale Bot cae5626e6c feat(session-tree): append-only entry journal + /tree /branch /fork /resume (#5262) ...

- Every session entry carries id + parentId, leafId tracks active position,
  in-memory tree projects from journal, context rebuilds root->leaf.
- Tree operations as commands: /tree (render), /branch (move leaf only,
  never rewrites history), /fork (new session from any node, interactive
  picker per #576 via /fork picker), /resume (picker + foreign-session
  import/export container).
- branch_summary and compaction entries are first-class SessionEntryKind
  variants (data shape lands now, strategies deferred).
- Spawn-depth tracking on SessionMetadata and Journal; fork increments.
- Foreign-session import/export via SessionImportContainer so /resume can
  ingest sessions from other agents.
- SavedSession journal migration: old linear messages -> journal entries
  with linked parent chain, leaf = last; new sessions write both journal
  and derived messages for compat. Atomic write/fsync/crash-checkpoint
  and MAX_SESSIONS=50 preserved.
- Shares entry shape with compaction (same SessionEntry envelope).

Co-depends on #5261 engine split (core journal placeholder already
landed in parallel work on same branch).

2026-08-07 06:29:10 -07:00

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