Clean up build artifacts and update .gitignore for Rust project

Remove unnecessary build artifacts from the target directory, including various fingerprint files and cached information. Update the .gitignore to ensure these files are not tracked in the future, streamlining the project and reducing clutter.

.gitignore

@@ -1,54 +1,60 @@
-# === Rust artifacts ===
+# === Rust build artifacts ===
+
 /target/
 /Cargo.lock
 
-# === IDEs & editors ===
+# === IDE & Editor settings ===
+
 .idea/
 .vscode/
-*.swp
-*.swo
-*.bak
-*~
+\*.swp
+\*.swo
+\*.bak
+\*\~
 
 # === OS files ===
-.DS_Store
+
+.DS\_Store
 Thumbs.db
 ehthumbs.db
 desktop.ini
 
-# === Logs and build artifacts ===
-*.log
-*.out
-*.err
+# === Logs & Runtime output ===
 
-# === Marlin-specific ===
-/index.db
-index.db
-*.sqlite
-*.sqlite-wal
-*.sqlite-shm
+\*.log
+\*.out
+\*.err
+
+# === Coverage reports ===
+
+cobertura.xml
+tarpaulin-report.html
+
+# === Test databases & scratch data ===
 
-# === Tests and scratch ===
 /tmp/
-*.test.db
+\*.test.db
 test.db
 
-# === Environment variables and secrets ===
+# === Project databases ===
+
+/index.db
+\*.sqlite
+\*.sqlite-wal
+\*.sqlite-shm
+
+# === Benchmarks & backups ===
+
+/bench/corpus/
+/bench/backups/
+
+# === Environment variables & secrets ===
+
 .env
-.env.*
+.env.\*
 
+# === Other generated files ===
 
-# === Other Files ===
+\*.html
 repo-context.txt
-saved_config.yaml
-
-# === Other Dirs ===
-/bench/corpus
-/bench/backups
-/target/
-/cobertura.xml
-/tarpaulin-report.html
-target/.rustc_info.json
-target/release/marlin
-target/release/marlin.d
-tarpaulin-report.html
+saved\_config.yaml