feat(math): clojure-legacy blob emission + selection parity — Clojure-exact math_main at step 0#2649
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This was referenced Jul 22, 2026
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docs(delphi): R1-parity goal docs, journal (2026-07-18 → 07-22 s3), quirks + divergence ledger
#2626
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…-exact math_main at step 0
Aligns clojure-legacy emission and selection semantics with Clojure's
prep-main blob (conv_man.clj:45-74), per the step-0 battery diagnosis
(journal 2026-07-22 session 3; fingerprints in docs/divergences.json).
Battery effect: vw:uniform8 (8 steps), vw:single-cut and
biodiversity:uniform8 (8 steps) went from DIVERGENCE to full MATCH;
vw:front-loaded6 remains open (base-cluster count edge at small N).
Emission (Conversation.to_dict, legacy-gated, improved unchanged):
- group-clusters: members emitted as BASE-CLUSTER ids (Clojure folded
form); unfolded pids stay under the snake alias group_clusters.
- votes-base: per-base-cluster A/D/S bucket lists over sort-by-id
clustered members (agg-bucket-votes-for-tid, conversation.clj:601-608)
instead of whole-matrix int totals.
- pca: comment-projection + comment-extremity emitted (existing D12 fns).
- Sign parity: pca.center, base-clusters.x/y, group-clusters centers,
comment-projection negated at emission — Delphi's matrix is the
NEGATION of Clojure's (AGREE=+1 vs -1); comps are covariance-derived
and already equal (verified max|clj+py| = 1e-16 on center).
- repness: {gid: [finalize-cmt-stats-shaped entries]} (repness.clj:173),
internal dict preserved under repness_full for from_dict round-trip.
- mod-in/mod-out/lastModTimestamp: null until moderation applied.
- tids emitted in Clojure column (first-vote arrival) order with pca
arrays permuted alongside; from_dict inverts the center sign and
restores the arrival tracker in legacy mode.
Selection/stat parity:
- group-aware-consensus multiplies (A+1)/(S+2) over EVERY group — a
zero-S group contributes 1/2, not skipped (conversation.clj:639-641).
- repness rest-stats sum over the OTHER GROUPS only (repness.clj:125),
excluding unclustered voters from the comparison domain.
- Exact-score ties in repness/consensus selection resolve by Clojure's
stable sort over named-matrix column order: update_votes tracks
first-vote arrival order, conv_repness accepts tid_order and the
selectors iterate as-given in legacy mode.
Also: skip the three math-tree-hashing harness tests in delphi-only CI
images (no /math in the container; run 29881478306's 3 failures).
TDD: tests/test_legacy_blob_shape.py (25 tests, RED observed per fix).
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Aligns clojure-legacy emission and selection semantics with Clojure's
prep-main blob (conv_man.clj:45-74), per the step-0 battery diagnosis
(journal 2026-07-22 session 3; fingerprints in docs/divergences.json).
Battery effect: vw:uniform8 (8 steps), vw:single-cut and
biodiversity:uniform8 (8 steps) went from DIVERGENCE to full MATCH;
vw:front-loaded6 remains open (base-cluster count edge at small N).
Emission (Conversation.to_dict, legacy-gated, improved unchanged):
form); unfolded pids stay under the snake alias group_clusters.
clustered members (agg-bucket-votes-for-tid, conversation.clj:601-608)
instead of whole-matrix int totals.
comment-projection negated at emission — Delphi's matrix is the
NEGATION of Clojure's (AGREE=+1 vs -1); comps are covariance-derived
and already equal (verified max|clj+py| = 1e-16 on center).
internal dict preserved under repness_full for from_dict round-trip.
arrays permuted alongside; from_dict inverts the center sign and
restores the arrival tracker in legacy mode.
Selection/stat parity:
zero-S group contributes 1/2, not skipped (conversation.clj:639-641).
excluding unclustered voters from the comparison domain.
stable sort over named-matrix column order: update_votes tracks
first-vote arrival order, conv_repness accepts tid_order and the
selectors iterate as-given in legacy mode.
Also: skip the three math-tree-hashing harness tests in delphi-only CI
images (no /math in the container; run 29881478306's 3 failures).
TDD: tests/test_legacy_blob_shape.py (25 tests, RED observed per fix).
commit-id:0add28f3
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