evidence-groundinglisted

# Evidence Grounding No challenge without evidence. No alternative without proof it works. No claim without data. ## Canonical Library This skill is the single source of truth for evidence standards. Other skills (the whole analysis spine: godfly, assumptions-check, competing-hypotheses, failure-analysis, devils-advocate, red-blue-review, premortem-postmortem, root-cause, troubleshooting-investigator, deep-dive) that need evidence tiers, quality gates, or the counter-evidence obligation must link here instead of restating these rules. If another skill's evidence language conflicts with this one, the tiers and gates defined here win. It also works standalone -- invoke it directly for "prove it", "back this up", "is this grounded", or "evidence check" requests. ## Core Principle The difference between a useful challenge and noise is EVIDENCE. "This won't scale" is noise. "Your current query does a full table scan on a 10M row table with no index on the filter column -- here's the query plan" is evidence. This skill ensures every challenge is grounded in reality. ## Evidence Hierarchy Not all evidence is equal. Rate what you find: | Tier | Type | Example | Weight | |------|------|---------|--------| | **S** | Measured data from this system | "Your p99 latency is 2.3s, here's the trace" | Definitive | | **A** | Code/config in this codebase | "Line 47 of the request handler does not roll back on failure" | Strong | | **B** | Production post-mortem from similar system | "Se