fix(todo): append reminders after tool results

[Gujiassh]

Summary

• append todo reminders after tool results instead of prepending them in the anthropic tool-result payload
• keep tool result ordering stable for both the s03 and full agent loops
• add focused regression coverage for the reminder ordering behavior

Testing

• python3 -m unittest tests.test_tool_result_ordering

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[Gujiassh]

Refresh complete on latest main.

• Rebases applied to fix/tool-result-ordering and force-pushed at 8f83ca1
• Resolved rebase conflict in agents/s03_todo_write.py while preserving tool_result-before-reminder behavior
• Validation:
  • python3 -m unittest tests.test_tool_result_ordering
  • python3 -m py_compile agents/s03_todo_write.py agents/s_full.py tests/test_tool_result_ordering.py

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