Revert "feat: 添加 /goal 命令，支持长时间运行任务的目标管理 (#1222)" (#1236)

This reverts commit d66a6f6124.

src/constants/prompts.ts

@@ -57,7 +57,6 @@ import {
   resolveSystemPromptSections,
 } from './systemPromptSections.js'
 import { SLEEP_TOOL_NAME } from '@claude-code-best/builtin-tools/tools/SleepTool/prompt.js'
-import { getGoalContinuationPrompt } from '../services/goal/goalState.js'
 import { TICK_TAG } from './xml.js'
 import { logForDebugging } from '../utils/debug.js'
 import { loadMemoryPrompt } from '../memdir/memdir.js'
@@ -506,11 +505,6 @@ ${CYBER_RISK_INSTRUCTION}`,
     ...(feature('KAIROS') || feature('KAIROS_BRIEF')
       ? [systemPromptSection('brief', () => getBriefSection())]
       : []),
-    DANGEROUS_uncachedSystemPromptSection(
-      'goal_continuation',
-      () => getGoalContinuationPrompt(),
-      'Goal state changes between turns',
-    ),
   ]
 
   const resolvedDynamicSections =