fix: stabilize Runtime workflows for 0.12.3

OpenCode status checks could cold-start throwaway servers, unrelated
conversations could block each other, and model, Continue, or remote paths
could replay or duplicate work under failure and backlog conditions. Settings
could also lose edits or overwrite unrelated model fields.

This update makes status checks passive, keeps per-conversation ordering while
allowing concurrency, preserves native long-running work with bounded display
capture and backpressure, narrows retries to known pre-dispatch failures, and
aligns remote Ask permissions without reducing Execute. It also keeps
Embedding updates narrow, improves settings and browser guidance, removes the
unused legacy Main gateway state, and records the validated Desktop 0.12.3 and
Agent 0.11.17 release metadata.

Release note: 改善 OpenCode 切换、多会话长任务、模型重试、远程 Ask/Execute 与设置保存可靠性，并完成 Desktop 0.12.3 / Agent 0.11.17 发布准备。

src/agent-daemon/runtime-acp-backend.ts

@@ -83,7 +83,8 @@ const DEFAULT_MAXIMUM_OPERATIONS_PER_BINDING = 1_000
 const DEFAULT_DISPOSE_TIMEOUT_MS = 10_000
 const OWNED_PROMPT_CANCEL_GRACE_MS = 1_000
 const OWNED_PROMPT_START_TIMEOUT_MS = 2 * 60_000
-const ACP_JOURNAL_RETRY_MILLISECONDS = 25
+const ACP_JOURNAL_RETRY_INITIAL_MILLISECONDS = 25
+const ACP_JOURNAL_RETRY_MAXIMUM_MILLISECONDS = 1_000
 
 export type RuntimeAcpBackendErrorCode =
   | 'capacity'
@@ -1976,6 +1977,7 @@ export class RuntimeAcpBackend {
       try {
         await this.#enqueueOutput(binding, payload, async () => {
           const sequence = binding.nextOutputSequence.toString()
+          let retryDelay = ACP_JOURNAL_RETRY_INITIAL_MILLISECONDS
           while (true) {
             try {
               this.#options.journal.appendAcpFrame({
@@ -1998,7 +2000,11 @@ export class RuntimeAcpBackend {
                 )
               }
               this.#assertBeforeDeadline(binding)
-              await delay(ACP_JOURNAL_RETRY_MILLISECONDS)
+              await delay(retryDelay)
+              retryDelay = Math.min(
+                ACP_JOURNAL_RETRY_MAXIMUM_MILLISECONDS,
+                retryDelay * 2
+              )
             }
           }
           binding.nextOutputSequence += 1n