fix: exclude build/vendor/VCS directories from search tool (#226)

* fix: exclude build/vendor/VCS directories from search tool

grep -rn recursed into .git, node_modules, target, __pycache__, etc.
producing hundreds of noise hits from generated content.  Add
--exclude-dir flags for common directories that should never appear
in search results.

* fix: glob egg-info pattern and add vendor exclude

Copilot review: .egg-info misses turnstone.egg-info (named dirs),
use *.egg-info glob.  Also add vendor to the exclude list.

turnstone/core/session.py

@@ -4285,6 +4285,21 @@ class ChatSession:
                     "-m",
                     "200",  # max matches per file
                     "--color=never",  # no ANSI codes in output
+                    # Skip common build/vendor/VCS directories
+                    "--exclude-dir=.git",
+                    "--exclude-dir=node_modules",
+                    "--exclude-dir=target",
+                    "--exclude-dir=__pycache__",
+                    "--exclude-dir=.mypy_cache",
+                    "--exclude-dir=.ruff_cache",
+                    "--exclude-dir=.pytest_cache",
+                    "--exclude-dir=dist",
+                    "--exclude-dir=build",
+                    "--exclude-dir=*.egg-info",
+                    "--exclude-dir=.tox",
+                    "--exclude-dir=.venv",
+                    "--exclude-dir=venv",
+                    "--exclude-dir=vendor",
                     "--",
                     pattern,
                     path,  # -- prevents pattern as flag