Claude Code reads settings.json from CLAUDE_CONFIG_DIR when it is set,
while lite login --config-claude wrote to ~/.claude/settings.json and
lite claude checked that same file for its apiKeyHelper. With the
override set, lite could drop ANTHROPIC_AUTH_TOKEN because the helper
lives in a file Claude Code never reads, leaving it with no key at all.
claude_settings_path(environ) now picks the file the way Claude Code
does, and both commands go through it. The CLI test directory gets an
autouse conftest that isolates HOME, USERPROFILE, and CLAUDE_CONFIG_DIR
per test and fails any test that writes the developer's real
settings.json, restoring it first.
