Refactor agent spawning and delegation check mechanisms

- Updated agent spawning from `Task()` to `Agent()` across various files to align with new standards.
- Enhanced the `code-developer` agent description to clarify its invocation context and responsibilities.
- Introduced a new `delegation-check` skill to validate command delegation prompts against agent role definitions, ensuring content separation and conflict detection.
- Established comprehensive separation rules for command delegation prompts and agent definitions, detailing ownership and conflict patterns.
- Improved documentation for command and agent design specifications to reflect the updated spawning patterns and validation processes.

.claude/skills/prompt-generator/templates/command-md.md

@@ -49,12 +49,13 @@ allowed-tools: {tools}           # omit if unrestricted
 
 {Construct prompt with <files_to_read>, <objective>, <output> blocks.}
 
-```
-Task(
-  prompt=filled_prompt,
-  subagent_type="{agent-name}",
-  description="{Verb} {target}"
-)
+```javascript
+Agent({
+  subagent_type: "{agent-name}",
+  prompt: filled_prompt,
+  description: "{Verb} {target}",
+  run_in_background: false
+})
 ```
 
 ## 4. Handle Result