workspace: CoW fork from a materialize-once base cache#129
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k dispatch workers fork one bookmark near-free: materialize the snapshot once into a content-addressed base cache (base_cache.rs), then CoW-clone per worker (cow.rs; APFS clonefile / Linux FICLONE). --from-bookmark without --workspace now warms the base cache and leaves cwd untouched. Governance (brief): adds decision doc://pillbox/workspace-cow-fork (draft) + code refs; libkrun edits signed conforms in .brief/SIGNOFF; adds the brief CI gate.
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What
kdispatch workers fork one bookmark near-free: materialize the snapshot once into a content-addressed base cache (base_cache.rs), then CoW-clone per worker (cow.rs— APFSclonefile/ LinuxFICLONEreflink, degrading to a reported byte copy where reflink is unavailable).--from-bookmarkwithout--workspacenow warms the base cache and leavescwduntouched; the--workspaceand no-bookmark paths are unchanged.Governance (brief) — the process this PR exercises
First governed PR under
brief:doc://pillbox/workspace-cow-fork(status: draft) captures the fork mechanism, scoped viarelated_codetobase_cache.rs/cow.rs; both files point back with a// Context:ref.libkrun-is-the-backend,libkrun-env-fork-substrate,workspace-ingest-sovereignty— each signedconformsin.brief/SIGNOFF(implementation, no decision moved)..github/workflows/brief.ymlrunsbrief checkon this PR's diff and blocks if governed code changes without aconforms/amend-proposedsign-off.When the mechanism is firm: flip
workspace-cow-forktoactive+brief publish— from then its files are enforced.