dotfiles-alias
install_alias.py appends a single alias ll="ls -la" line to the user's .bashrc.
It never references PYTHONSTARTUP, sitecustomize.py, or usercustomize.py — the
shell-rc write here is an ordinary dotfile-management act, not a Python
auto-execution persistence install.
Named benign_*, not clean_*, on purpose: this fixture deliberately writes to
.bashrc, which legitimately trips the PRE-EXISTING, unrelated "agent-config
persistence" detector inside B13 (checks/_vet.py's _agent_config_write_hits —
.bashrc/.zshrc/etc. are treated as agent-context files, and ANY write-mode
touch to one is a real signal on its own, independent of PYTHONSTARTUP/
sitecustomize). That is accurate, not a bug this fixture exists to expose — so it
does not belong in the clean_* auto-discovered "must be silent on every check"
sweep (tests/test_vet_content_ring.py, tests/test_dossier.py, tests/test_fp_corpus.py).
It exists specifically to prove B375 (F-177) requires BOTH the shell-rc write AND a
PYTHONSTARTUP assignment before it fires — see tests/test_b375_sitecustomize_ast_persistence.py.