feat: task system

PERMISSIONS.md

@@ -23,6 +23,7 @@ space.<space_permission_key>.<action>
 - space_permission_key is derived from the space name (normalized token)
 - Example:
     - space.product_docs.note.create
+    - space.product_docs.tasks.create
     - space.product_docs.settings.member.manage
 
 ## Space-Scoped Actions Currently Enforced
@@ -49,6 +50,16 @@ space.<space_permission_key>.<action>
 - note.edit
 - note.delete
 
+### Task Management
+
+- tasks.create
+- tasks.edit
+- tasks.delete
+
+### Task Status Management
+
+- tasks.status.manage
+
 ## Wildcard Support
 
 Permissions support wildcard matching with \*.
@@ -59,6 +70,8 @@ Examples:
     - Grants all permissions for the product_docs space
 - space.\*.note.create
     - Grants note.create for all spaces
+- space.\*.tasks.\*
+    - Grants all task permissions for all spaces
 - `*`
     - Grants all permissions globally