Clarify or remove the LOG_DEBUG Python debug alias

[codeforester]

Problem

lib/python/base_cli/config.py treats LOG_DEBUG=1 as a way to activate Python CLI debug logging alongside the documented BASE_CLI_LOG_LEVEL=debug path.

LOG_DEBUG is used by Base wrapper/debug plumbing and mentioned in wrapper-level README text, but it is not clearly documented in the runtime environment table as an internal compatibility signal or public user knob. That makes the debug surface harder to reason about.

Verified from Claude finding: #67, with severity reduced.

Desired outcome

Decide whether LOG_DEBUG is an internal compatibility alias that should be documented as such, or remove the Python-layer alias in favor of the explicit BASE_CLI_LOG_LEVEL setting.

Scope

• Audit wrapper/setup uses of LOG_DEBUG before removing anything.
• If kept, document its intended ownership and relationship to BASE_CLI_LOG_LEVEL.
• If removed from Python config, preserve wrapper debug behavior through the explicit supported env var.

Acceptance criteria

• Runtime/debug documentation matches base_cli.config behavior.
• Wrapper debug modes still work.
• No undocumented user-facing debug path remains unintentionally public.