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/between.rs

@@ -0,0 +1,55 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead, BufReader};
+
+fn main() -> io::Result<()> {
+    let args: Vec<String> = env::args().collect();
+    if args.len() < 2 {
+        eprintln!("Usage: {} start-end [count] [file...]", args[0]);
+        std::process::exit(1);
+    }
+
+    let range = &args[1];
+    let (start, mut end) = if let Some(dash_pos) = range.find('-') {
+        (range[..dash_pos].parse().unwrap(), range[dash_pos + 1..].parse().unwrap())
+    } else {
+        (range.parse().unwrap(), 0)
+    };
+
+    let mut count = 1;
+    let mut files_start = 2;
+
+    if end == 0 {
+        if args.len() > 2 {
+            if let Ok(c) = args[2].parse::<usize>() {
+                count = c;
+                files_start = 3;
+            }
+        }
+        end = start + count - 1;
+    }
+
+    if args.len() > files_start {
+        for filename in &args[files_start..] {
+            let file = File::open(filename)?;
+            let reader = BufReader::new(file);
+            process_lines(reader, start, end)?;
+        }
+    } else {
+        // No files provided, read from stdin
+        let stdin = io::stdin();
+        let reader = stdin.lock();
+        process_lines(reader, start, end)?;
+    }
+
+    Ok(())
+}
+
+fn process_lines<R: BufRead>(reader: R, start: usize, end: usize) -> io::Result<()> {
+    reader.lines()
+          .enumerate()
+          .filter_map(|(i, line)| if i + 1 >= start && i + 1 <= end { line.ok() } else { None })
+          .for_each(|line| println!("{}", line));
+
+    Ok(())
+}