chore(deps): upgrade tokio, gix, tempfile, add rayon, bump to v0.3.0

- tokio 1.43 -> 1.50, gix 0.78 -> 0.80, tempfile 3.25 -> 3.26
- Add rayon 1.11 for CPU-bound tree-sitter parallel parsing
- Move toml to dev-dependencies (only used in tests)
- Bump version to 0.3.0 and MSRV to 1.94 (edition 2024)

Author: Sephyi

.gitignore

@@ -28,6 +28,7 @@ target/
 # Mutation testing data
 **/mutants.out*/
 
-# --- AI / Claude -------------------------------------------------------------
+# --- AI ----------------------------------------------------------------------
 
-.claude
+.claude/
+docs/