glob: stop ripgrep when results sufficient and ignore heavy dirs

[ry2009]

• Ripgrep file listing now stops the underlying rg --files process when consumers exit early (e.g., after hitting the 100-result cap), preventing full-tree scans from pegging CPU.
• Glob tool now ignores common heavy directories by default (node_modules, .venv, .direnv, .cache, dist, build, out, .next, target, coverage, tmp, temp, pycache), reducing work for typical searches.