Other adapters that matched at the same top specificity — a non-empty list
means the repo looks like more than one harness (e.g. a CLAUDE.md + an
AGENTS.md), so the pick is ambiguous; resolve with --harness.
Readonlyfallback
fallback:boolean
True when detection found no harness markers and fell back to the default.
The result of auto-detecting a harness from a repo's layout.