space handle (repo + relations Datalog db); spawn! = branch-from-briefing with a genesis spawn commit at the fork point; commit! verb snapshots a full worktree VALUE into a typed agent-commit and CAS-advances the branch (no shared index — multi-agent safe). Topology: fork-point via merge-base, agents from refs, typed edges sub-agent-of/reviews/merges. Session merges always record a two-parent session-merge commit (no-ff); conflicts commit nothing and conclude via merge-resolve!. 53/53 (118/118 total). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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