investigate

The Infiquetra systematic-debugging engine. Find the ROOT CAUSE of a bug, test failure, error, or unexpected behavior BEFORE any fix — trace the full trigger→symptom causal chain with no gaps, ground every hypothesis in observed evidence, and only then apply a GATED, trivial-scope, self-verified fix. Diagnosis is the primary deliverable: it writes an agent-consumable DEBUG REPORT, routes real implementation work to /work via a /handoff issue, design problems to /brainstorm, and trackable defects to /handoff. READ-ONLY on the world and the saga; never commits, pushes, opens a PR, or deploys. Triggers on "investigate", "debug this", "why is this failing", "trace this error", "root cause", a pasted stack trace / error message / issue ref, or a /qa or /loop hand-in for a deep failure.