docs(client): correct checkpoint pin contract

tsconfig.client.json

@@ -37,15 +37,12 @@
     // client-side Context merges keep it out of the host program.
     { "path": "./packages/host/directory-picker-native" },
     { "path": "./packages/host/directory-picker-browse" },
-    // Compaction seam: the client-runtime drift trap value-imports the seam's
-    // canonical checkpoint const from the package ROOT, which may be reached
-    // from this TEST program but never from a packages/client/* package
-    // program — the root reaches dsh-session's root, whose Context merge
-    // declares the host `sessions: SessionStore` and collides with the
-    // client's `ISessions`. Package programs use the cordis-free
-    // dsh-compact/checkpoint leaf instead (a type-only import in
-    // transcript-adapter.ts), which needs this reference on the runtime
-    // package project itself.
+    // Compaction seam: the client-runtime pin test value-imports the canonical
+    // checkpoint const from the cordis-free dsh-compact/checkpoint leaf and
+    // deliberately never loads the dsh-compact package root or the host-side
+    // Context merges reachable through it. The client package pins the same
+    // leaf through a type-only import in transcript-adapter.ts; composite
+    // rootDir rules make both paths depend on this runtime project reference.
     { "path": "./packages/compact/compact" },
     { "path": "./packages/client/ui-slots" },
     { "path": "./packages/client/schema-form" },