chore: cleanup — untrack binaries, consolidate Go dirs, dedupe tools

- Untrack and delete compiled binaries (tarsum, gosoft.exe, rust uniq/uniq2);
  ignore build outputs (dist/, bin/, *.exe, *.test, .ruff_cache/)
- Merge tools/go/ and projects/go-tools/go/ into projects/go-tools/<name>/
- Fix goipgrep .gitignore: bare 'ipgrep' pattern was ignoring cmd/ipgrep/,
  so the main entrypoint was never tracked; now anchored to /ipgrep
- Archive duplicate implementations to archive/experimental/{rust,go}/
  (uniq, between, tarsum rewrites); canonical versions stay in tools/
- Update README tool catalog to match new layout

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

archive/experimental/rust/uniq2.rs

@@ -0,0 +1,36 @@
+use std::collections::HashSet;
+use std::hash::{Hash, Hasher};
+use std::collections::hash_map::DefaultHasher;
+
+struct HashOnlySet {
+    set: HashSet<u64>,
+}
+
+impl HashOnlySet {
+    fn new() -> HashOnlySet {
+        HashOnlySet { set: HashSet::new() }
+    }
+
+    fn insert<T: Hash>(&mut self, item: &T) -> bool {
+        let hash = Self::hash_item(item);
+        self.set.insert(hash)
+    }
+
+    fn contains<T: Hash>(&self, item: &T) -> bool {
+        let hash = Self::hash_item(item);
+        self.set.contains(&hash)
+    }
+
+    fn hash_item<T: Hash>(item: &T) -> u64 {
+        let mut hasher = DefaultHasher::new();
+        item.hash(&mut hasher);
+        hasher.finish()
+    }
+}
+
+fn main() {
+    let mut set = HashOnlySet::new();
+    set.insert(&"Hello, world!");
+    println!("Contains 'Hello, world!': {}", set.contains(&"Hello, world!"));
+    println!("Contains 'Goodbye, world!': {}", set.contains(&"Goodbye, world!"));
+}