Root-cause walk on $ARGUMENTS

Root-cause walk on $ARGUMENTS

Walk upstream from $ARGUMENTS, ranking predecessors by error rate.

Workflow

1. If $ARGUMENTS does not contain :: (so it's likely a service or API name, not a full node_id), call search_catalog(catalog="graph", query="$ARGUMENTS") to resolve. Take the top match if unambiguous; otherwise list options and ask the user.
2. Call get_time_intervals(duration_minutes=720, num_windows=1).
3. Read the active domain from ${CLAUDE_PLUGIN_DATA}/../karmaiq-core/domain.txt.
4. Call root_cause_candidates(node_id="<resolved>", metric="errors", depth=3, top_k=10, epochStartTime=..., epochEndTime=..., domain="<active>").
5. Render the top 5 candidates with error % and QPM. End with:
   • One concrete next call (e.g. get_api_deep_dive on the worst candidate)
   • Or routing to karmaiq-firefighter:fire <candidate> for a deeper end-to-end run

Path preservation

If $ARGUMENTS contains a route path, preserve it byte-for-byte — never rewrite ([^/]+) to {id}.