Add AI developer tools profile

[codeforester]

Summary

• Add an explicit ai prerequisite profile for Codex CLI and Claude Code setup/check/doctor flows.
• Extend shell validation, onboarding, Bash/Zsh completions, and docs for the new profile.
• Add stable doctor finding coverage for AI tool availability/version checks.

Validation

• PYTHONPATH=lib/python:cli/python /Users/rameshhp/.base.d/base/.venv/bin/python -m unittest cli/python/base_dev/tests/test_engine.py
• bats cli/bash/commands/basectl/tests/setup.bats cli/bash/commands/basectl/tests/check.bats cli/bash/commands/basectl/tests/doctor.bats cli/bash/commands/basectl/tests/onboard.bats cli/bash/commands/basectl/tests/completions.bats
• git diff --check
• env -u BASE_HOME ./bin/base-test

Demo Impact

• Adds an opt-in basectl setup/check/doctor --profile ai path; no default setup behavior changes.

Closes #380