feat(membership): emit estimation rows and refuse atomistic collapse

[seonghobae]

Summary

#37–#53 remain review-blocked (no independent APPROVE). #37 and #45 kept ready. Next no-0008 gap: estimator-input rows in existing membership_core (no new crate, no collision with #48/#49/#51/#53).

• estimation_rows_at emits one row per active membership
• Known author+department+project weights recover total 2.0 with computed RMSE
• refuse_atomistic_collapse denies a one-row subset when multiplicity is 3

Test plan

• RED: estimation_rows_contract failed with E0432/E0599
• cargo test -p membership_core --offline
• cargo clippy -p membership_core --all-targets --offline -- -D warnings
• python3 scripts/validate_documentation.py and check_docstrings.py
• exact-head required Checks (do not treat queued evidence as passed)

Do not self-approve or merge. Prefer merge #37 then #45 when eligible. Do not allocate 0008.

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