Fix CRLF line endings by adding eol=lf to .gitattributes (#212)

## Description

Adds `eol=lf` to the catch-all `.gitattributes` rule, changing it from:

```
* text=auto
```

to:

```
* text=auto eol=lf
```

Without `eol=lf`, the checkout line ending falls back to the user's
`core.autocrlf` setting. Users with `core.autocrlf=true` (common in
dotfiles synced from Windows setups) will check out files with CRLF even
on Linux/macOS/Codespaces, which can cause CRLF to appear in PRs.

Adding `eol=lf` explicitly overrides `core.autocrlf` at the repo level,
ensuring LF checkout for everyone regardless of their global git config.

All tracked files were renormalized via `git add --renormalize .` — 5
files had latent CRLF that was cleaned up.

## How was this tested

- Ran `git add --renormalize .` to verify which files were affected
- Confirmed the commit diff shows CRLF → LF normalization in the
affected files

## Type of change

- [x] Bug fix

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: iclanton

.gitattributes

@@ -1,5 +1,5 @@
 # Set default behavior to automatically normalize line endings.
-* text=auto
+* text=auto eol=lf
 
 # Don't allow people to merge changes to these generated files, because the result
 # may be invalid.  You need to run "rush update" again.