Steady scope-note register (A1–A52)

A structured register of roughly 50 detectors (A1–A52) watches every steady solve and classifies each finding into one of four tiers — refuse (HTTP error, no numbers at all), blocking (numbers returned but datasheet/export gated), warn, or info — so the caller always knows exactly how much to trust a given result.

• You got a result and want to know whether it's fully trustworthy, trustworthy-with-a-caveat, or not safe to size equipment from.
• You're deciding whether a builder result can be issued as a datasheet — check has_blocking before anything else.
• You're extending the solver into new physics and need to know whether the new gap should refuse, block, warn, or just note.

Each detector is an independent, additive check against the actual solved state (not the user's stated intent) — for example one detector blocks a network-global result when a relief device is present without proper handling, another refuses outright, others warn on wide-boiling mixtures, high-pressure Z-factor deviation, or a gas node flashing non-vapour. Detectors never silently combine — every fired note keeps its own code and message.