fix: remove avoidable model runtime limits

Preserve long histories and parsed attachments, expose paged process and Subagent output, isolate MCP discovery failures, and expand browser snapshots and knowledge result selection. Remove fixed Harness output and updated remote Runtime duration limits.

Keep released Agent profile and v1 bridge compatibility while enabling larger framed exchanges and optional limits for updated peers. Document remote coverage requirements and real-model boundary validation.

Release note: Long model tasks can retain more context and continue reading complete tool output; remote execution preserves compatibility with released Agents. Updated remote limits require an updated Agent and Runtime bundle.

src/agent-daemon/model-bridge-helper.ts

@@ -111,7 +111,7 @@ export type ModelBridgeHelperSpawn = (
 
 const LOOPBACK_HOST = '127.0.0.1'
 const DEFAULT_MAXIMUM_CONNECTIONS = 8
-const DEFAULT_REQUEST_TIMEOUT_MS = 180_000
+const DEFAULT_REQUEST_TIMEOUT_MS = 0
 const RESPONSE_CLOSE_TIMEOUT_MS = 2_000
 const MAXIMUM_HTTP_HEADER_BYTES = 16 * 1024
 const MAXIMUM_HTTP_HEADER_COUNT = 32
@@ -162,8 +162,8 @@ export class ModelBridgeLoopbackProxy {
     )
     this.#requestTimeoutMs = boundedInteger(
       options.requestTimeoutMs ?? DEFAULT_REQUEST_TIMEOUT_MS,
-      1,
-      300_000,
+      0,
+      0x7fff_ffff,
       'Model bridge loopback request timeout'
     )
   }
@@ -295,12 +295,12 @@ export class ModelBridgeLoopbackProxy {
     }
     incoming.once('aborted', onAborted)
     outgoing.once('close', onResponseClose)
-    const timeout = setTimeout(() => {
+    const timeout = this.#requestTimeoutMs === 0 ? undefined : setTimeout(() => {
       cancellation.abort(
         new ModelBridgeBrokerError('request-timeout')
       )
     }, this.#requestTimeoutMs)
-    timeout.unref?.()
+    timeout?.unref?.()
 
     try {
       const request = await parseHttpRequest(