feat(aircoding): AirCoding V2 baseline — deterministic multi-agent architecture

Forked from OpenCode v1.17.4 with multi-agent system:
- 5 agents: aircoding, scheduler, worker, architect, reviewer
- Deterministic DAG scheduling engine (coordinator_tick)
- Tool whitelists as hard enforcement
- AirCoding validation plugin
- System prompt injection for routing
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/tui/src/feature-plugins/system/notifications.ts

@@ -0,0 +1,94 @@
+import type { Event } from "@opencode-ai/sdk/v2"
+import type { TuiAttentionSoundName, TuiPlugin, TuiPluginApi } from "@opencode-ai/plugin/tui"
+import type { BuiltinTuiPlugin } from "../builtins"
+
+const id = "internal:notifications"
+
+type SessionError = Extract<Event, { type: "session.error" }>["properties"]["error"]
+
+function notify(api: TuiPluginApi, sessionID: string | undefined, message: string, sound: TuiAttentionSoundName) {
+  const session = sessionID ? api.state.session.get(sessionID) : undefined
+  const isSubagent = session?.parentID !== undefined
+  void api.attention.notify({
+    title: session?.title,
+    message,
+    notification: isSubagent ? false : { when: "blurred" },
+    sound: { name: sound, when: "always" },
+  })
+}
+
+function sessionErrorMessage(error: SessionError) {
+  if (error?.name === "MessageAbortedError") return "Session aborted"
+  const data = error?.data
+  if (data && typeof data === "object" && "message" in data && data.message === "SSE read timed out") {
+    return "Model stopped responding"
+  }
+  return "Session error"
+}
+
+const tui: TuiPlugin = async (api) => {
+  const active = new Set<string>()
+  const errored = new Set<string>()
+  const questions = new Set<string>()
+  const permissions = new Set<string>()
+
+  api.event.on("question.asked", (event) => {
+    if (questions.has(event.properties.id)) return
+    questions.add(event.properties.id)
+    notify(api, event.properties.sessionID, "Question needs input", "question")
+  })
+
+  api.event.on("question.replied", (event) => {
+    questions.delete(event.properties.requestID)
+  })
+
+  api.event.on("question.rejected", (event) => {
+    questions.delete(event.properties.requestID)
+  })
+
+  api.event.on("permission.asked", (event) => {
+    if (permissions.has(event.properties.id)) return
+    permissions.add(event.properties.id)
+    notify(api, event.properties.sessionID, "Permission needs input", "permission")
+  })
+
+  api.event.on("permission.replied", (event) => {
+    permissions.delete(event.properties.requestID)
+  })
+
+  api.event.on("session.status", (event) => {
+    const sessionID = event.properties.sessionID
+    if (event.properties.status.type === "busy" || event.properties.status.type === "retry") {
+      active.add(sessionID)
+      errored.delete(sessionID)
+      return
+    }
+
+    if (event.properties.status.type !== "idle") return
+    if (!active.has(sessionID)) return
+    active.delete(sessionID)
+
+    if (errored.has(sessionID)) {
+      errored.delete(sessionID)
+      return
+    }
+
+    const session = api.state.session.get(sessionID)
+    notify(api, sessionID, "Session done", session?.parentID ? "subagent_done" : "done")
+  })
+
+  api.event.on("session.error", (event) => {
+    const sessionID = event.properties.sessionID
+    if (!sessionID) return
+    if (!active.has(sessionID)) return
+    errored.add(sessionID)
+    notify(api, sessionID, sessionErrorMessage(event.properties.error), "error")
+  })
+}
+
+const plugin: BuiltinTuiPlugin = {
+  id,
+  tui,
+}
+
+export default plugin