#M3 — VariantPool (candidate inventory + emitter trace)

Preface node heading:m3-variantpool-candidate-inventory-emitter-trace:79382

#What this page is

This is generated FPF reference text from the specification preface or supporting sections. It helps interpret FPF; it is not FPF Reference product documentation.

#Methodology

Use it to understand how the specification wants to be read, then return to a route, pattern, or work packet for active work. Cite generated IDs only when the wording changes the task decision.

#Content

Governs (kit surface):

• VariantPoolId bound to CG‑FrameContext
• per‑candidate minimal traceability fields (emitter identity, EmitterPolicyRef (policy‑id/ref; defined by the governing pattern), method/generator refs when declared, edition pins, provenance anchors)
• optional, per‑candidate assurance preview pointers (e.g., PathSliceId? and/or SCRId? when early assurance is recorded) and optional QD/Open‑Ended scaffolding stubs (only when introduced by explicit GPatternExtension blocks)

Guardrails (via G.Core):

• tri‑state eligibility handling, penalties routing, crossing visibility, and set‑return constraints are not defined here; they are enforced via G.Core conformance.

Governing pattern for method payload: method‑specific emitter semantics are governed by Extensions (e.g., C.17, C.18, C.19). M3 MUST remain method‑agnostic in its core definition: it is an inventory surface, not an algorithm spec.

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Last Updated: 2026-06-17 — upstream FPF commit 646b0b9b (github.com/ailev/FPF)