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

docs/architecture/build-distribution.md

@@ -1,6 +1,6 @@
 ---
 status: draft
-last_updated: 2026-04-30
+last_updated: 2026-05-01
 ---
 
 # Build & Distribution
@@ -9,32 +9,38 @@ Dependencies, project structure, tree-shaking, sub-path exports, and build targe
 
 ## Dependencies
 
+No runtime dependencies. The `Repeater` class is inlined from `@repeaterjs/repeater` (MIT) — no external package required.
+
 | Package | Type | Purpose |
 |---------|------|---------|
-| `@repeaterjs/repeater` | direct | Small (~3KB). Core async iterable primitive for `subscribe()`. |
+| (none) | runtime | — |
 | `ioredis` | peer (optional) | Redis client. Only imported by `event-target-redis.ts`. Type-only import at compile time. |
 | `@rayhanadev/iroh` | peer (optional, future) | Iroh NAPI-RS binding. Only imported by `event-target-iroh.ts`. |
 
-No other external dependencies. No logger dependency.
+No logger dependency. No TypeBox dependency (call protocol and schemas moved to `@alkdev/operations`).
 
 ## Project Structure
 
 ```
 @alkdev/pubsub/
   src/
-    index.ts              # Barrel: re-exports core API
-    types.ts              # TypedEvent, TypedEventTarget, etc.
-    create_pubsub.ts      # createPubSub factory
-    operators.ts          # filter, map, pipe
-    event-target-redis.ts # createRedisEventTarget (peer dep: ioredis)
+    index.ts                 # Barrel: re-exports core API + operators
+    types.ts                 # TypedEvent, TypedEventTarget, EventEnvelope
+    create_pubsub.ts         # createPubSub factory (adapted from graphql-yoga)
+    operators.ts             # filter, map, pipe, take, reduce, toArray,
+                             #   batch, dedupe, window, flat, groupBy, chain, join
+    repeater.ts              # Inlined from @repeaterjs/repeater (MIT)
+    event-target-redis.ts    # createRedisEventTarget (peer dep: ioredis)
     # Future adapters (each is its own entry point + peer dep island):
-    # event-target-websocket.ts  # peer dep: none (web standard)
-    # event-target-iroh.ts       # peer dep: @rayhanadev/iroh
+    # event-target-websocket.ts  # (peer dep: none, web standard)
+    # event-target-worker.ts     # (peer dep: none, web standard)
+    # event-target-iroh.ts       # (peer dep: @rayhanadev/iroh)
   test/
     create_pubsub.test.ts
     operators.test.ts
     event-target-redis.test.ts
     # event-target-websocket.test.ts
+    # event-target-worker.test.ts
     # event-target-iroh.test.ts
   docs/
     architecture.md
@@ -56,6 +62,7 @@ We use explicit sub-path exports rather than barrel-only + tree-shaking. Each ad
     ".": { ... },
     "./event-target-redis": { ... },
     "./event-target-websocket": { ... },
+    "./event-target-worker": { ... },
     "./event-target-iroh": { ... }
   }
 }
@@ -86,21 +93,6 @@ Optional peer deps means `npm install @alkdev/pubsub` does NOT install ioredis o
 - **Target**: `es2022`
 - **Splitting**: enabled (tsup code splitting for shared chunks)
 
-```ts
-// tsup.config.ts
-import { defineConfig } from 'tsup';
-
-export default defineConfig({
-  entry: ['src/index.ts', 'src/event-target-redis.ts'],
-  format: ['esm', 'cjs'],
-  dts: true,
-  sourcemap: true,
-  clean: true,
-  splitting: true,
-  target: 'es2022',
-});
-```
-
 ## Testing
 
 - **Runner**: `vitest` — matches taskgraph, natural fit with tsup/Node build pipeline