chore: remove outdated task implementation instructions and technical content evaluator agent

- Deleted the task implementation instructions file located at `.agent/rules/task-implementation.instructions.md` to streamline the documentation.
- Removed the technical content evaluator agent file located at `.github/agents/technical-content-evaluator.agent (1).md`, as it is no longer needed.

style: update coding assistance rules for consistency

- Adjusted line breaks in `.agent/rules/v5.md` and `.windsurf/rules/v5.md` for improved readability by removing unnecessary trailing spaces.
- Ensured consistent formatting in the coding assistance rules section.

fix: update workflow progress panel icons for better UX

- Changed the icon for "in-progress" workflow events from `XCircleIcon` (red) to `Loader2Icon` (blue) in `app/workflows/components/workflow-progress-panel.tsx` to better represent ongoing processes.
- Updated the text color for "in-progress" events from red to blue in the same file to maintain consistency with the new icon.

docs: enhance architecture diagram in README

- Updated the architecture diagram in `README.md` to reflect changes in the chat component structure, including new classes and relationships for agent plans, tasks, and artifacts.