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/goal/goal-session/src/index.ts

@@ -147,6 +147,11 @@ export function apply(ctx: Context): void {
         ctx.goals.block(state.agent, ref, { code: outcome.code, message: outcome.message })
         return
       case 'disarm':
+        // TODO(disarm-reason): `GoalRoundOutcome.disarm.reason` carries a
+        // specific string (durability-failed/disposed/interrupted) that is
+        // produced in `classifyGoalRound()` but discarded here. Either log it
+        // or remove it from the variant to stop dead payload being carried
+        // through the result type.
         ctx.goals.disarm(state.agent)
         return
       /* v8 ignore next 2 -- GoalRoundOutcome is closed and every member is handled above */