Feat/rustfmt config

[dev-RAM11]

Closes #86

What was done

Added .rustfmt.toml to standardize Rust formatting rules across the workspace and ran cargo fmt --all to apply formatting to the entire codebase.

Files changed

• .rustfmt.toml — new formatting config using stable rustfmt options

Formatting rules enforced

• edition = "2021"
• 4 spaces indentation, no hard tabs
• Max line width of 100 characters
• Unix newlines
• Imports reordered and modules reordered
• Tall function parameter layout
• use_field_init_shorthand and use_try_shorthand enabled
• Nested parens removed automatically

Verification

cargo fmt --all -- --check passes with no errors across all workspace crates.

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