Generate native core discovery from typed dispatch contracts

PROTOCOL.md

@@ -222,6 +222,7 @@ these areas fails.
 /proc/
   core/
     PROTOCOL.md          this file
+    discover.json        generated core.rpc.discover document
     graph.json           plugins, imports, and the result of each check
     graph.dot            the same graph for Graphviz
     locks.json           held locks and waiting processes
@@ -389,6 +390,7 @@ At start, the core starts each service in `/config/boot.yaml`, in order:
 
 | Method | Params | Result |
 | --- | --- | --- |
+| `core.rpc.discover` | none | generated OpenRPC 1.2 document for every native core method |
 | `core.call` | `method`, `params`, `detach`? | the result of the method |
 | `core.watch` | `path` | stays open; `armed`, then `changed` notifications (section 4) |
 | `core.notify` | `name`, `params` | none (a notification) |
@@ -402,6 +404,17 @@ At start, the core starts each service in `/config/boot.yaml`, in order:
 | `core.restart` | none | `{}`. With `SAUSAGE_LOOP=1`, schedule clean shutdown and exit code 75. |
 | `core.exit` | none | Alias of `core.restart`: same supervisor gate, response, coalescing, and exit code 75. |
 
+`core.rpc.discover` and `/proc/core/discover.json` expose the same document,
+with unprefixed method names, just like a plugin's discovery document. The
+core generates it from the parameter and result types used by its dispatch;
+there is no separate JSON schema file to maintain. Copy the proc file to
+`imports/core.json` and use `import!("core")` to get typed calls, including
+`core::lock` and `core::log`. Dotted wire names become underscores in Rust
+(`rpc.discover` becomes `rpc_discover`). Import checks recognize the native
+core as a provider without requiring a `plugins/core` directory. Forwarded
+results and discovery documents contain arbitrary JSON; other core results
+are typed, including activation summaries and journal entries.
+
 ### Host restart
 
 **HARD RULE: the mediator and all agents NEVER call `core.restart` without
@@ -472,7 +485,8 @@ imported method:
 - There are no version numbers. This check replaces them.
 - The check covers a fixed subset of JSON Schema: objects with `properties`
   and `required`, the primitive types, arrays, optional and nullable values,
-  string enums, integer ranges, and `$ref`. A construct outside the subset
+  string enums, integer ranges, typed dictionaries (`additionalProperties`
+  with a value schema), and `$ref`. A construct outside the subset
   fails the check.
 - The check covers calls, not state. Old and new processes share the files in
   `/state`, and `core.revert` restores only code. A plugin must keep its