docs(post-mortem): Apply session start checklists and edit tool warnings

From gui_decoupling_controller track post-mortem:

workflow.md:
- Add mandatory session start checklist (6 items)
- Add code style section with 1-space indentation enforcement
- Add native edit tool warning with MCP alternatives

AGENTS.md:
- Add critical native edit tool warning
- Document MCP tool alternatives for file editing

tier1-orchestrator.md:
- Add session start checklist

tier2-tech-lead.md:
- Add session start checklist
- Add tool restrictions section (allowed vs forbidden)
- Add explicit delegation pattern

tier3-worker.md:
- Add task start checklist

tier4-qa.md:
- Add analysis start checklist

AGENTS.md

@@ -91,17 +91,36 @@ When uncertain about threading, event flow, data structures, or module interacti
 
 ## Code Style
 
+- **IMPORTANT**: DO NOT ADD ***ANY*** COMMENTS unless asked
+- Use 1-space indentation for Python code
+- Use type hints where appropriate
+## Code Style
+
 - **IMPORTANT**: DO NOT ADD ***ANY*** COMMENTS unless asked
 - Use 1-space indentation for Python code
 - Use type hints where appropriate
 - Internal methods/variables prefixed with underscore
 
-## Quality Gates
+### CRITICAL: Native Edit Tool Destroys Indentation
 
-Before marking any task complete:
-- [ ] All tests pass
-- [ ] Code coverage meets requirements (>80%)
-- [ ] Code follows project's code style guidelines
-- [ ] All public functions documented (docstrings)
-- [ ] Type safety enforced (type hints)
-- [ ] No linting or static analysis errors
+The native `Edit` tool DESTROYS 1-space indentation and converts to 4-space.
+
+**NEVER use native `edit` tool on Python files.**
+
+Instead, use Manual Slop MCP tools:
+- `manual-slop_py_update_definition` - Replace function/class
+- `manual-slop_set_file_slice` - Replace line range
+- `manual-slop_py_set_signature` - Replace signature only
+
+Or use Python subprocess with `newline=''` to preserve line endings:
+```python
+python -c "
+with open('file.py', 'r', encoding='utf-8', newline='') as f:
+    content = f.read()
+content = content.replace(old, new)
+with open('file.py', 'w', encoding='utf-8', newline='') as f:
+    f.write(content)
+"
+```
+
+## Quality Gates