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docs: start historical retrieval shadow benchmark - #356

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sungjunlee merged 1 commit into
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codex/historical-retrieval-shadow
Jul 31, 2026
Merged

docs: start historical retrieval shadow benchmark#356
sungjunlee merged 1 commit into
mainfrom
codex/historical-retrieval-shadow

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Summary

  • freeze 20 historical gold questions across dev-backlog, dev-relay, and consumer repositories
  • record Day-0 legacy mirror, live-source, and disposable-report observations with source pointers and failure atomicity
  • preserve retrieval as non-authoritative, non-committed output and keep the 4–6 week organic reuse gate open

Supports #350. This PR intentionally does not close the issue. Earliest go/no-go remains 2026-08-28.

Day-0 evidence

  • Arm A: direct mirror coverage 2/20
  • Arm B: 20/20 top-3 question hits, 0 major errors, median 5.952 s / 2 calls
  • Arm C: 20/20 question hits, 37/41 eligible Issue/PR pointers, 0 major errors, conservative median 0.794 ms / 1 local call
  • projected maintenance: 6.27 min/month
  • missing-source probe: non-zero exit; report SHA-256, mtime, and size unchanged

These are synthetic Day-0 results, not organic reuse evidence.

Verification

  • node --test skills/backlog-triage/scripts/*.test.js skills/dev-backlog/scripts/*.test.js — 454 pass, 1 skip, 0 fail
  • node --test skills/dev-backlog/scripts/contract-prose.test.js — 9/9 pass
  • git diff --check
  • independent final review: no findings

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  • backlog/sprints/2026-07-github-native-core-simplification.md
  • docs/historical-retrieval-shadow.md
  • skills/dev-backlog/scripts/contract-prose.test.js

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@sungjunlee
sungjunlee merged commit 8b02ebd into main Jul 31, 2026
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sungjunlee deleted the codex/historical-retrieval-shadow branch July 31, 2026 14:02

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Reviewed commit: 761c81f41d

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Comment on lines +208 to +212
The decision requires at least ten organic questions covering dev-backlog,
dev-relay, and consumer repositories, at least two weeks between first and last
real reuse, and no decision before 2026-08-28. If live sources remain sufficient,
close #350 with no compiler. If Arm C wins every gate, propose a separate
`project-memory` skill and human-gated charter amendment; do not productize it

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P2 Badge Require organic coverage for every compared arm

When the organic observations are imbalanced—for example, nine Arm B questions and one easy Arm C question—the ten-question and two-week conditions are satisfied even though Arm C's recall, error rate, and medians are based on a single sample. Because each log record contains only one arm and this decision gate specifies neither paired B/C observations nor a per-arm minimum, the Day-0 result could support proposing project-memory without demonstrating Arm C across the required organic question set. Require paired observations for each question, or equivalent per-arm coverage across all repository classes.

Useful? React with 👍 / 👎.

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