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d8a55f3334
Gemini prompt + structural validator now enforce:
- Consecutive Bloom delta MUST be 1 or 2 (rejects Δ=0 same-level pairs
and Δ≥3 huge jumps; backward steps already impossible)
- Strict +1 preferred; +2 accepted only when no +1 candidate exists
- A question can appear in up to 2 chains, but only if it's L1 or L2
(foundational anchor pattern); 3+ chain memberships are rejected as
over-stuffing
Empirical alignment: 70% of legacy chains were strict +1, 19% had +2
jumps, 8% had +3 jumps that we now reject as too-large pedagogical
moves. The new rules tighten quality while keeping the bulk of
defensible existing structure expressible.