refactor(dcp-for-compaction): migrate from experimental config to hook system

- Add 'dcp-for-compaction' to HookNameSchema
- Remove dcp_for_compaction from ExperimentalConfigSchema
- Update executor.ts to use dcpForCompaction parameter
- Enable DCP by default (can be disabled via disabled_hooks)
- Update all 4 README files (EN, KO, JA, ZH-CN)

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src/config/schema.ts

@@ -66,6 +66,7 @@ export const HookNameSchema = z.enum([
   "empty-message-sanitizer",
   "thinking-block-validator",
   "ralph-loop",
+  "dcp-for-compaction",
 ])
 
 export const BuiltinCommandNameSchema = z.enum([
@@ -172,8 +173,6 @@ export const ExperimentalConfigSchema = z.object({
   truncate_all_tool_outputs: z.boolean().default(true),
   /** Dynamic context pruning configuration */
   dynamic_context_pruning: DynamicContextPruningConfigSchema.optional(),
-  /** Enable DCP (Dynamic Context Pruning) for compaction - runs first when token limit exceeded (default: false) */
-  dcp_for_compaction: z.boolean().optional(),
 })
 
 export const SkillSourceSchema = z.union([