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feat(math): mode collapse C4 — delete-only improved branches (ban filter, tally sources, blob shape) - #2669

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feat(math): mode collapse C4 — delete-only improved branches (ban filter, tally sources, blob shape)#2669
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@jucor jucor commented Jul 27, 2026

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GOAL_CUTOVER_READY.md Phase 2, chunk C4 — the non-parked deletions
(inventory: journal s7). conversation.py and pca_kmeans_rep/ are now
engine_mode-FREE (grep: 0 hits):

  • Q1 ban filtering DELETED OUTRIGHT (Julien: bans are not a Polis
    feature; queue item 1 dropped) — rating_mat = raw copy, mod_out_ptpts
    ingested-but-inert, exactly like the Clojure worker.
  • repness tid_order: always the arrival-order tie-break.
  • group-votes tally source: always raw_rating_mat (3 sites).
  • in-conv: carry + greedy floor always (improved threshold-only arm
    deleted); blob in-conv serializes the persisted set when present.
  • votes-base: always Clojure-exact bucket vectors.
  • group-aware-consensus: always the every-group Laplace product
    (zero-S groups contribute 1/2, FP-b3670cb052).
  • to_dict: _apply_legacy_blob_shape unconditional; from_dict: watermark/
    arrival-order/sign/permutation restore unconditional.
  • repness totals: always clustered-voters-only rest domain.

Deleted 18 improved-mode test pins across 6 test files (12 were failing
against the collapsed engine, 6 passing only vacuously); 65+34 tests
green on the affected files.

commit-id:fe2b0bb2


Stack:


⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

…ter, tally sources, blob shape)

GOAL_CUTOVER_READY.md Phase 2, chunk C4 — the non-parked deletions
(inventory: journal s7). conversation.py and pca_kmeans_rep/ are now
engine_mode-FREE (grep: 0 hits):

- Q1 ban filtering DELETED OUTRIGHT (Julien: bans are not a Polis
  feature; queue item 1 dropped) — rating_mat = raw copy, mod_out_ptpts
  ingested-but-inert, exactly like the Clojure worker.
- repness tid_order: always the arrival-order tie-break.
- group-votes tally source: always raw_rating_mat (3 sites).
- in-conv: carry + greedy floor always (improved threshold-only arm
  deleted); blob in-conv serializes the persisted set when present.
- votes-base: always Clojure-exact bucket vectors.
- group-aware-consensus: always the every-group Laplace product
  (zero-S groups contribute 1/2, FP-b3670cb052).
- to_dict: _apply_legacy_blob_shape unconditional; from_dict: watermark/
  arrival-order/sign/permutation restore unconditional.
- repness totals: always clustered-voters-only rest domain.

Deleted 18 improved-mode test pins across 6 test files (12 were failing
against the collapsed engine, 6 passing only vacuously); 65+34 tests
green on the affected files.

commit-id:fe2b0bb2
This was referenced Jul 27, 2026
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