Fix project recreate-venv repair

[codeforester]

Summary

• Scope --recreate-venv to Base only when setup targets Base or no project.
• Pass project recreate intent into bootstrap so stale project venvs are backed up before pip bootstrap.
• Add shell and Python regressions for project-targeted recreate.

Validation

• PYTHONPATH=lib/python:cli/python /Users/rameshhp/.base.d/base/.venv/bin/python -m unittest cli.python.base_setup.tests.test_artifacts.ArtifactReconcileTests.test_recreate_project_venv_backs_up_stale_venv_before_install
• PYTHONPATH=lib/python:cli/python /Users/rameshhp/.base.d/base/.venv/bin/python -m pytest cli/python/base_setup/tests/test_artifacts.py -q
• env BASE_BASH_LIBS_DIR=/Users/rameshhp/work/base-bash-libs/lib/bash bats cli/bash/commands/basectl/tests/setup.bats
• env -u BASE_HOME BASE_BASH_LIBS_DIR=/Users/rameshhp/work/base-bash-libs/lib/bash ./bin/base-test
• git diff --check

Fixes #923