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>

projects/go-tools/goipgrep/scripts/build.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env sh
+set -eu
+
+cd "$(dirname "$0")/.."
+
+mkdir -p dist
+
+VERSION="${VERSION:-dev}"
+COMMIT="${COMMIT:-$(git rev-parse --short HEAD 2>/dev/null || echo unknown)}"
+DATE="${DATE:-$(date -u +%Y-%m-%dT%H:%M:%SZ)}"
+
+EXTRA_LDFLAGS=""
+GOOS="$(go env GOOS)"
+if [ "$GOOS" = "darwin" ]; then
+  # Some macOS environments treat missing LC_UUID as fatal; external linkmode
+  # ensures the toolchain emits LC_UUID.
+  EXTRA_LDFLAGS="-linkmode=external"
+fi
+
+go build \
+  -trimpath \
+  -ldflags "-s -w ${EXTRA_LDFLAGS} -X main.version=${VERSION} -X main.commit=${COMMIT} -X main.date=${DATE}" \
+  -o dist/ipgrep \
+  ./cmd/ipgrep
+
+echo "built dist/ipgrep"