Say on every directory how it treats files it does not know, and check it (issue 1024, ADR 0422)

Every directory and archive resource carries `unknown`: move-out for a home folder whose program writes nothing there (the node-engine, delivered in mesh-host #117, moves the rest to ~/.local/state/mesh-moved/<module>/ with a list), module for ~/.ssh and ~/.claude, program elsewhere; `knows` keeps what a program or the operator relies on (powerlevel10k's compiled files, i3's scripts and the asus/g14 drop-ins, dunst's slack rule, betterbird's records, node-env's forge credential, issue 1033). Two shared folders are no longer declared. Each module's README says it. checks/owned holds every manifest to it; checks/sshdir stays while main's merge check runs it (issue 1035). Tests that pin a manifest follow the new key only. Reviewed in three rounds.

modules/build-agent/README.md

@@ -32,3 +32,11 @@ wins over it, and each build's log says which the build resolved from. A build t
 `package` artifact, an image whose Dockerfile names `.npmrc`, a TypeScript artifact with an `@novox/`
 dependency) on an agent with neither fails before building, naming the machine. Go artifacts and images
 that do not name `.npmrc` build without it. `manifest_test.go` holds the manifest to this.
+
+## Files it does not know
+
+Each directory or archive this module declares says how it treats a file it did not write (ADR 0422, ADR 0416).
+
+- `${dir:mesh-state}`: everything in it is the program's; the mesh moves nothing out (ADR 0422 §2).
+- `${dir:workspace}`: everything in it is the program's; the mesh moves nothing out (ADR 0422 §2).
+- `${dir:judge-cache}`: everything in it is the program's; the mesh moves nothing out (ADR 0422 §2).

modules/build-agent/module.json

@@ -56,17 +56,20 @@
       "id": "mesh-state",
       "type": "directory",
       "mode": "0700",
-      "place": "mesh"
+      "place": "mesh",
+      "unknown": "program"
     },
     {
       "id": "workspace",
       "type": "directory",
-      "mode": "0700"
+      "mode": "0700",
+      "unknown": "program"
     },
     {
       "id": "judge-cache",
       "type": "directory",
-      "mode": "0700"
+      "mode": "0700",
+      "unknown": "program"
     },
     {
       "id": "agent-env",