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Hare c78f7f7d80 feat: replace revision counters with domain state contracts
Use content digests, key fingerprints, binding and trust identities, immutable mutation receipts, and observation tokens instead of state-update ordinals across API, storage, Runtime, and Web contracts.

Preserve historical replay and secret material through frozen migrations; preflight uncertain removals before cutover, resume provisioning receipts, validate encrypted migration candidates, and align fresh/upgraded schemas. Include reviewed regression fixes, generated artifacts, and validation evidence.
2026-10-10 15:55:20 +09:00

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## Workspace Drive
Drive is Backend-owned workspace storage, not a Workdir or a host filesystem path. Feature/Profile activation is not a grant; every operation is checked by the Backend. Use the exposed Drive tools or the native WIP `/drive` entry with bounded listing and reading. Do not enumerate a Drive tree or infer authority from a visible reference.
Observe an entry before replacing or deleting it; the host/client retains the last committed request observed for that entry and checks it again when writing. On conflict, reread and reconcile rather than overwriting blindly. On `OutcomeUnknown`, retain the request ID and query request status before another mutation: the operation may have committed. Save a Workdir file into Drive only through a current scoped attachment using its logical relative source path; saving does not attach a Workdir or grant file access.
Internal SubWorkers currently have no explicit Backend Drive grant mechanism. They must not inherit Drive access through a parent's shared WorkspaceClient, even with an enabled or inherited Profile. Ask the authorized parent to perform the operation instead.