Simplify to transport-only: remove call protocol, add EventEnvelope, expand stream operators

- Remove src/call.ts (PendingRequestMap, CallEventSchema, CallError) — call protocol belongs in @alkdev/operations
- Add EventEnvelope type ({ type, id, payload }) as the cross-platform serialization contract
- Simplify createPubSub: replace PubSubPublishArgsByKey tuple model with PubSubEventMap; publish(type, id, payload) and subscribe(type, id) use explicit id for topic scoping
- Update Redis adapter to serialize/deserialize full EventEnvelope
- Expand operators: add take, reduce, toArray, batch, dedupe, window, flat, groupBy, chain, join
- Remove @alkdev/typebox runtime dependency (was only used by call.ts)
- Remove ./call sub-path export from package.json and tsup config
- Update all architecture docs to reflect transport-only scope, add Worker adapter, remove call protocol references
- Remove docs/architecture/call-protocol.md
- Update AGENTS.md with new source layout and transport-only principle

package.json

@@ -26,16 +26,6 @@
         "types": "./dist/event-target-redis.d.cts",
         "default": "./dist/event-target-redis.cjs"
       }
-    },
-    "./call": {
-      "import": {
-        "types": "./dist/call.d.ts",
-        "default": "./dist/call.js"
-      },
-      "require": {
-        "types": "./dist/call.d.cts",
-        "default": "./dist/call.cjs"
-      }
     }
   },
   "publishConfig": {
@@ -62,9 +52,7 @@
     "quic"
   ],
   "license": "MIT OR Apache-2.0",
-  "dependencies": {
-    "@alkdev/typebox": "^0.34.49"
-  },
+  "dependencies": {},
   "peerDependencies": {
     "ioredis": "^5.0.0"
   },