fix: Remove unnecessary metadata and timestamps from task and workflow documentation

.claude/commands/task/create.md

@@ -103,10 +103,6 @@ Context inherited from workflow
     "last_attempt": null
   },
   
-  "meta": {
-    "created": "2025-09-05T10:30:00Z",
-    "updated": "2025-09-05T10:30:00Z"
-  }
 }
 ```
 

.claude/commands/task/replan.md

@@ -135,13 +135,11 @@ Each replan creates a new version with complete history:
   "replan_history": [
     {
       "version": "1.1",
-      "date": "2025-09-08T10:00:00Z",
       "reason": "Original plan",
       "input_source": "initial_creation"
     },
     {
       "version": "1.2", 
-      "date": "2025-09-08T14:00:00Z",
       "reason": "Add OAuth2 authentication support",
       "input_source": "direct_text",
       "changes": [
@@ -196,7 +194,7 @@ When task is replanned, the corresponding section in IMPL_PLAN.md is updated:
   - Token management (added)
   - Password reset
 
-*Last updated: 2025-09-08 14:00 via task:replan*
+*Last updated via task:replan*
 ```
 
 ### Plan Update Process

.claude/commands/workflow/issue/close.md

@@ -85,7 +85,7 @@ Choice: _
 
 ### Status Update
 - Changes status from "open" to "closed"
-- Records closure timestamp
+- Records closure details
 - Saves closure reason and category
 
 ### Integration Cleanup

.claude/commands/workflow/issue/update.md

@@ -80,7 +80,7 @@ Choice: _
 - Validates priority and type values
 
 ### Change Tracking
-- Records update timestamp
+- Records update details
 - Tracks who made changes
 - Maintains change history
 
@@ -95,7 +95,6 @@ Maintains audit trail:
 {
   "changes": [
     {
-      "timestamp": "2025-09-08T10:30:00Z",
       "field": "priority",
       "old_value": "high",
       "new_value": "critical",