feat(dashboard): Conductor panel — fleet, tasks and cancel over server-side proxy (PRD RF3) (#8221)

* feat(a2a): conductor bridge core — event mapping with canceled->cancelled

* feat(a2a): incremental SSE parser for conductor bridge

* feat(a2a): conductor bridge connection loop with persisted cursor and backoff

* feat(a2a): start conductor bridge at boot behind CONDUCTOR_HUB_URL

* fix(a2a): conductor bridge parses the hub's real SSE wire format (id/type in frame, data={ts,payload})

* docs(reference): document CONDUCTOR_HUB_URL/TOKEN in ENVIRONMENT.md (env-doc-sync gate)

* feat(a2a): fleet skills derived from the Conductor hub for the agent card

* feat(a2a): agent card announces Conductor fleet skills

* feat(dashboard): server-side hub proxy for the Conductor panel (whitelisted shapes, fail-open)

* feat(dashboard): /api/conductor proxy routes (fleet, task detail, cancel) behind management auth

* feat(dashboard): Conductor panel — fleet live view, task detail and cancel over /api/conductor proxy

---------

Co-authored-by: backryun <bakryun0718@proton.me>

src/shared/constants/sidebarVisibility/sections.ts

@@ -243,6 +243,15 @@ const TOOLS_GROUP: SidebarItemGroup = {
       subtitleKey: "cloudAgentsSubtitle",
       icon: "cloud",
     },
+    {
+      id: "conductor",
+      href: "/dashboard/conductor",
+      i18nKey: "conductor",
+      subtitleKey: "conductorSubtitle",
+      icon: "account_tree",
+      labelFallback: "Conductor",
+      subtitleFallback: "CLI-agent fleet",
+    },
     {
       id: "agent-bridge",
       href: "/dashboard/tools/agent-bridge",

src/shared/constants/sidebarVisibility/types.ts

@@ -29,6 +29,7 @@ export const HIDEABLE_SIDEBAR_ITEM_IDS = [
   "cli-agents",
   "acp-agents",
   "cloud-agents",
+  "conductor",
   "agent-bridge",
   "traffic-inspector",
   "discovery",