- /proc is a core layer: core/ (PROTOCOL.md, graph.json, graph.dot,
locks.json, plugins/<name>/discover.json and client.rs) and one folder
per process (info.json, log, and its /self files).
- Locks are released only after the task ended, the store dropped, and
in-flight file operations returned.
- core.activate and core.revert with copies, discovery, compatibility
checks of imports and consumers, groups, force. An admission gate
makes the snapshot of old processes complete.
- Graph of discover documents by hash, refreshed by a file watcher.
- Upgrades: grace periods (x-sausage-grace), stop, service restarts,
rpc.retired.
- SDK plugins in the real core (cli/tests/sdk.rs).
