P3-31 Approximation tiers enforcement (reference vs fast)

[Kinin-Code-Offical]

(Synced from docs/current_status/issue_ready_backlog.md)\n\n# P3-31 Approximation tiers enforcement (reference vs fast)\n\nSummary

• Area: product architecture
• Deliverable: spec for what may differ and where.

Acceptance Criteria

• Tiers are defined.
• Tests or assertions prevent accidental use of “fast” tier when “reference” is required.

Test Plan

• Run a reference suite with both tiers and measure expected drift bounds.

Likely File Targets

• Docs + configuration + test harness

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[github-actions]

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