ref-signal-identificationlisted

# Signal Identification Reference `.claude/docs/signal-identification.md` is the single source of truth for the signal-identification contract. This skill is the entry point an align-signal-assessor (#2371 structural role, Unit 4; no live agent definition today) loads before classifying an intention node. Everything that defines categories, the economics inequality, field shapes, and invariants lives in that doc — this skill points at it; it does not restate it. ## When to use Invoke when deciding what observable says an intention is met and how to read it, and whether building or wiring a sensor is worth the cost. The align-signal-assessor role (no live agent definition today) loads this skill before each classification; the resulting `signal.eval.v1` output is consumed downstream by #2372, which wires the signal arm into the align loop. ## The contract Read `.claude/docs/signal-identification.md` before classifying. If the doc cannot be read, state so explicitly — do not proceed from memory. Apply the steps in order: 1. Run the [signal-identification classifier](../../docs/signal-identification.md#signal-identification-classifier) — test `existing_sensor` first, then `instrument`, else `proxy`. Emit a `category` and a mandatory `rationale` naming which test decided it. For `existing_sensor` or `proxy`, set `economics_verdict: "n/a"` and `economics_rationale: null`, then skip step 2 and proceed to step 3. 2. When `category == instrument`, run the [WORTH