ParadoxGameConverters / PGCG.commonItems / 23112094410

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Optimize LINQ usages (#790)

What Changed:

1. ExtensionMethods.cs:
Replaced LINQ-based remove path with:
- List fast path via RemoveAll.
- Non-list fallback using snapshot list and predicate check.

2. ModFilesystem.cs
- Replaced split+Any path-prefix matching with span-based component comparison.
- Replaced LINQ Count for slash counting with a direct loop helper.

PDXSerializer.cs
- Rewrote enumerable serialization to single-pass loops (no Cast/Select pipeline).
- Rewrote dictionary serialization to direct iteration with null filtering inline (no Where/Select/iterator pipeline).

1258 of 1428 branches covered (88.1%)

Branch coverage included in aggregate %.

73 of 75 new or added lines in 3 files covered. (97.33%)

3774 of 4021 relevant lines covered (93.86%)

45810.0 hits per line