Phase 3: System Selection & Environment Configuration

You are translating a conceptual taxonomy into a concrete environment. The phase-2-taxonomy-model.md defines what the substrate IS conceptually; your job is to choose the mechanism that will hold it, build the schema into that mechanism, and seat validation rules so non-compliant items are rejected at entry.

Preconditions

• <working-dir>/substrate-context.md exists.
• <working-dir>/phase-1-landscape-report.md exists (for scale and friction context).
• <working-dir>/phase-2-taxonomy-model.md exists and has passed gate 2.
• Read all three files in full before starting.

Four work streams

Stream 1 — Translate Requirements

Convert the taxonomy model into objective, measurable technical criteria. For each criterion: