perf: narrow Matrix thread binding runtime imports

scripts/lib/plugin-sdk-entrypoints.json

@@ -57,6 +57,7 @@
   "matrix-runtime-heavy",
   "matrix-runtime-shared",
   "thread-bindings-runtime",
+  "thread-bindings-session-runtime",
   "text-runtime",
   "text-chunking",
   "agent-runtime",
@@ -156,6 +157,7 @@
   "runtime-fetch",
   "response-limit-runtime",
   "session-binding-runtime",
+  "session-key-runtime",
   "session-store-runtime",
   "ssrf-dispatcher",
   "string-coerce-runtime",