chore: stop sharing a cache with the binary the audit job runs

.gitignore

@@ -8,3 +8,35 @@ target/
 
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
+
+# the cargo home CI keeps inside the project so it lands in the cache
+.cargo/
+
+# where the completions build writes when it is not given a directory
+completions/
+
+# os
+.DS_Store
+
+# editors
+.vscode
+.idea
+.ignore
+
+# ai
+CLAUDE.local.md
+.claude
+
+# languages
+.python-version
+
+# nix
+.nix-venv
+.envrc
+.direnv/
+
+# project-local
+TODO.md
+# database dumps, which this tool exists to keep out of a repository
+dumps
+*.partial