- Adjust rustfmt.toml to set tab_spaces = 4.
- Reformat imports, struct definitions, function bodies, and match arms
across the project to match the new style (aligned fields, added
spacing, etc.).
- Ensure all code complies with the updated rustfmt settings.
- Document new Rust formatting standards in AGENTS, CODE_MAP, and
PROGRESS.
- Add rustfmt.toml with style 2024, 2‑space indents, 100‑char width, LF
endings.
- Apply consistent 2‑space indentation and ordering across source files.
- Minor clean‑up of imports and whitespace to match the new style.