Make Generate deterministic and add CI verification step (#89)

* Make Generate deterministic by sorting files by relative path

The file system enumeration in FindDlls was non-deterministic because
Directory.GetFiles does not guarantee ordering, and the ordering varies
across operating systems. Fix by:

1. Collecting all results into a list instead of yielding immediately
2. Normalizing path separators to forward slash for consistent sorting
3. Sorting by relative path using ordinal comparison

This ensures the generated output is identical regardless of OS or
file system enumeration order.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add CI step to verify generated code is up-to-date

Runs the generator after restore and fails the build if there are any
uncommitted diffs, ensuring PRs always include freshly generated output.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix cross-OS path separator in targets resource paths

Path.Join uses the OS-specific separator between the prefix and the
relative path, producing different output on Windows vs Linux. Replace
with string interpolation using a consistent forward slash separator
since MSBuild handles both styles.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix double-slash in resource paths by trimming leading separator

On Linux, Substring(packagePrefix.Length) produces a leading / in the
relative path. Combined with the interpolated /, this caused // in the
output. TrimStart('/') after normalization ensures no leading separator.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Normalize line endings to LF for cross-OS determinism

Add .gitattributes to enforce LF line endings and normalize the
generator output with ReplaceLineEndings to always produce LF.
This ensures the generator produces identical output on Windows
and Linux, making the CI verification step pass on both platforms.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jaredpar

.gitattributes

@@ -0,0 +1,2 @@
+# Ensure consistent line endings across all platforms
+* text=auto eol=lf

.github/workflows/dotnet.yml

@@ -24,6 +24,11 @@ jobs:
       - name: Restore dependencies
         run: dotnet restore
 
+      - name: Verify generated code is up-to-date
+        run: |
+          dotnet run --project Src/Generate
+          git diff --exit-code || (echo "Generated code is out of date. Run 'dotnet run --project Src/Generate' and commit the results." && exit 1)
+
       - name: Build
         run: dotnet build --no-restore -bl