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python-math #1: docs(delphi): add math-algorithm history & routing-regression reference - #2613

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@jucor jucor commented Jul 17, 2026 •

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Adds delphi/docs/MATH_ALGORITHM_HISTORY.md — a git-archaeology reference of the core Polis math algorithms (comment routing, PCA/projection, extremity/repness, clustering, consensus/moderation): when each was introduced, every edit that changed numeric output, and known bugs, with verified commit hashes and dates. It includes the 2025 comment-routing regression (#1961, fixed in #2611), the pre-2018 uniform-random routing history, and a guide to mapping conversations to algorithm versions via the production deploy timeline.

Sourced entirely from public git history and code — no production data.

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com

commit-id:31321c47


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

Base automatically changed from spr/edge/ec8e2093 to edge July 18, 2026 02:53
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jucor force-pushed the spr/edge/31321c47 branch from 4019f25 to b7c34ac Compare July 18, 2026 13:28
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jucor requested a review from Copilot July 21, 2026 08:37
This was referenced Jul 27, 2026
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jucor force-pushed the spr/edge/31321c47 branch from 66b5323 to 873ee04 Compare July 28, 2026 00:11
@jucor jucor changed the title docs(delphi): add math-algorithm history & routing-regression reference python-math #1: docs(delphi): add math-algorithm history & routing-regression reference Jul 28, 2026
…gression reference

Adds `delphi/docs/MATH_ALGORITHM_HISTORY.md` — a git-archaeology reference of the core Polis math algorithms (comment routing, PCA/projection, extremity/repness, clustering, consensus/moderation): when each was introduced, every edit that changed numeric output, and known bugs, with verified commit hashes and dates. It includes the 2025 comment-routing regression (#1961, fixed in #2611), the pre-2018 uniform-random routing history, and a guide to mapping conversations to algorithm versions via the production deploy timeline.

Sourced entirely from public git history and code — no production data.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

commit-id:31321c47
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jucor force-pushed the spr/edge/31321c47 branch from 873ee04 to 71ddf14 Compare July 28, 2026 01:10
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jucor commented Oct 15, 2026

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Closing: this change is already on edge. Its commit 71ddf14c6 is byte-identical (same git patch-id) to 53650a964 on edge, which landed with the production deploy #2685 (merged 2026-09-08).

This PR was one layer of a jj spr stack. The stack's commits reached edge through #2685, so this PR was never merged or closed automatically. Closing it loses nothing.

@jucor jucor closed this Oct 15, 2026
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jucor deleted the spr/edge/31321c47 branch October 15, 2026 23:19
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