# issue-06-code-formatting: Apply Rust Standard Formatting with cargo fmt

## Description
Execute `cargo fmt --all` to apply Rust standard formatting across the entire codebase. This primarily affects benches/ directory files with import ordering and indentation issues. Formatting is idempotent and does not conflict with parallel code edits.

## Architecture Reference
Read architecture.md Section "Component 8: Code Formatting via cargo fmt" for:
- Expected file modifications (benches/*.rs with import ordering, indentation)
- Idempotent formatting behavior
- No-op behavior for already-formatted files

## Interface Contracts
- Implements: `cargo fmt --all` command execution
- Exports: Consistently formatted codebase following rustfmt standards
- Consumes: All *.rs files in src/, benches/, and tests/ directories
- Consumed by: None (standalone formatting operation)

## Isolation Context
- Available: All source files from prior-level issues (formatting-agnostic)
- NOT available: N/A (formatting operates on all files independently)
- Source of truth: architecture.md Component 8 (lines 545-583)

## Files
- **Modify (formatting only)**: All `*.rs` files (especially `benches/*.rs`)

## Dependencies
None (formatting is idempotent and non-conflicting)

## Provides
- Consistently formatted codebase following Rust standards
- Import ordering corrections in benchmark files

## Acceptance Criteria
- [ ] `cargo fmt -- --check 2>&1` exits with code 0 (all code properly formatted)
- [ ] `cargo build --lib 2>&1` exits with code 0 (compilation succeeds)
- [ ] `git diff` shows only formatting changes with no logic modifications

## Testing Strategy

### Test Files
N/A (formatting verification via commands)

### Test Categories
- **Formatting verification**: Run `cargo fmt -- --check` to verify all files formatted
- **Compilation check**: Run `cargo build --lib` to ensure no syntax errors introduced
- **Diff inspection**: Visual inspection of `git diff` to confirm only whitespace/ordering changes

### Run Command
```bash
cargo fmt --all
cargo fmt -- --check
cargo build --lib
```

## Verification Commands
- Format: `cargo fmt --all`
- Check: `cargo fmt -- --check 2>&1 && echo "PASS" || echo "FAIL"`
- Compile: `cargo build --lib 2>&1 && echo "SUCCESS" || echo "FAILED"`
