feat(hooks): enable tool-output-truncator by default

Enable tool-output-truncator hook by default instead of requiring experimental config opt-in. Users can disable it via disabled_hooks if needed.

Changes:
- Add tool-output-truncator to HookNameSchema
- Remove tool_output_truncator from ExperimentalConfigSchema
- Update all README files (EN, KO, JA, ZH-CN)

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src/config/schema.ts

@@ -49,6 +49,7 @@ export const HookNameSchema = z.enum([
   "session-notification",
   "comment-checker",
   "grep-output-truncator",
+  "tool-output-truncator",
   "directory-agents-injector",
   "directory-readme-injector",
   "empty-task-response-detector",
@@ -163,13 +164,11 @@ export const DynamicContextPruningConfigSchema = z.object({
 export const ExperimentalConfigSchema = z.object({
   aggressive_truncation: z.boolean().optional(),
   auto_resume: z.boolean().optional(),
-  /** Enable tool output truncator - dynamically truncates tool outputs based on context window (default: false) */
-  tool_output_truncator: z.boolean().optional(),
   /** Enable preemptive compaction at threshold (default: false) */
   preemptive_compaction: z.boolean().optional(),
   /** Threshold percentage to trigger preemptive compaction (default: 0.80) */
   preemptive_compaction_threshold: z.number().min(0.5).max(0.95).optional(),
-  /** Truncate all tool outputs, not just whitelisted tools (default: false, only applies when tool_output_truncator is enabled) */
+  /** Truncate all tool outputs, not just whitelisted tools (default: false). Tool output truncator is enabled by default - disable via disabled_hooks. */
   truncate_all_tool_outputs: z.boolean().optional(),
   /** Dynamic context pruning configuration */
   dynamic_context_pruning: DynamicContextPruningConfigSchema.optional(),