Code metrics
code_metrics
Best-effort code metrics for a package: LOC + module/function/class counts.
LOC is counted from src/**/*.py (filesystem only). Structural counts come
from axm-ast's ContextTool (already a dependency). Designed to feed a
kind="code" quality-history line; every failure is swallowed so it can never
break an audit.
collect_code_metrics(path)
Return {lines, modules, functions, classes, commits} (absent if unknown).