feat(gui): goal wire domain, client goal state, and docked goal bar

- apiproxy goals RPC domain (get/create/edit/pause/resume/complete/clear)
  with CAS refs, zod schemas, and fetch client/handler wiring
- client runtime session goal state: live goal/change meta triggers a
  coalesced refetch; mutations fold transport errors into RpcResult
- web GoalBar: docked strip above the composer (sparkle, phase label,
  truncated objective, inline edit, clear; resume when paused); creation
  stays on the /goal command
- GoalBarActions in the ui-conversation contract layer; IconSparkle16
  moves to ui-primitives icons

packages/host/apiproxy/src/api/rpc-map.ts

@@ -6,6 +6,7 @@
 
 import type { SessionsApi } from './sessions.ts'
 import type { HostApi } from './host.ts'
+import type { GoalsApi } from './goals.ts'
 import type { RpcResponse } from './rpc.ts'
 
 /** Method name → method signature. Signatures are the single source of truth; payload/value types are always derived from here. */
@@ -16,6 +17,13 @@ export interface RpcMethodMap {
   'session.prompt': SessionsApi['prompt']
   'session.cancel': SessionsApi['cancel']
   'host.describe': HostApi['describe']
+  'goal.get': GoalsApi['get']
+  'goal.create': GoalsApi['create']
+  'goal.edit': GoalsApi['edit']
+  'goal.pause': GoalsApi['pause']
+  'goal.resume': GoalsApi['resume']
+  'goal.complete': GoalsApi['complete']
+  'goal.clear': GoalsApi['clear']
 }
 
 /** Business request payload of method K (reaches through the RpcRequest narrow form to payload). */