feat: show leftover pairs on the grouping comparison strip (v0.86.0)

[seonghobae]

Buyer impact

After make seed, the grouping comparison strip names leftover post–criterion pairs on each visible row. Click the closest leftover on A-100 (or Demo Report High) to open that post. A leftover pair for a hidden post is omitted the same way a hidden member is.

The Period reports member list still shows leftover pairs above members (ADR 0018). This slice only adds the same authorized leftover store to the comparison strip so the buyer does not have to switch grouping first.

Scope

• GET /api/reports/compare/{period} carries ABAC-filtered leftover_pairs (ADR 0025).
• Comparison-row leftover buttons open the named post. Grouping-row click still switches grouping.
• Mean θ stays on the strip. Do not invent leftover numbers. Do not invent a theta.

Exact head

2aaac163c1ee5139ea9e48bc768518530088cfcf on feat/leftover-pairs-on-comparison-strip-v0860.

Base: main @ 8c020aa (merged #220 RankWeave).

Frontend: 46 tests, oxlint clean.

Review gate

• Do not mix into Role, responsibility, and agent ontology (v2.10.0) #74 or feat(ui): show business context on related-node chips (v0.75.0) #92.
• Independent exact-head APPROVE required before squash.
• Do not self-approve.
• Do not merge from this PR author.
• Owner/self COMMENT is not APPROVE.

Not in this slice

Leftover persist+list landed as #211. RankWeave landed as #220. Naming leftover on the opened post is #224. TEPP is #214. naruon mailbox is #217. ThreadWeave conversations are #219. Keyverse identity is #221. Orchestrator envelope is #228. Valkey outbox is #229.

References

Gabriel, K. R. (1971). The biplot graphic display of matrices with application to principal component analysis. Biometrika, 58(3), 453–467.

Jeon, M., Jin, I. H., Schweinberger, M., & Baugh, S. (2021). Mapping unobserved item–respondent interactions: A latent space item response model with interaction map. Psychometrika, 86(2), 378–403.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8c020aa and 2aaac16.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (14)

• AGENTS.md
• ARCHITECTURE.md
• CHANGELOG.d/0.86.0-leftover-comparison-strip.md
• CHANGELOG.md
• backend/app/main.py
• backend/app/report_ingestion.py
• backend/tests/test_api.py
• docs/adr/0025-leftover-pairs-on-comparison-strip.md
• frontend/package.json
• frontend/src/App.test.tsx
• frontend/src/App.tsx
• frontend/src/api.ts
• lineageweave/__init__.py
• pyproject.toml

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[seonghobae]

Exact head 2aaac16 is on main@8c020aa. Frontend 46 tests and oxlint are green locally. Auto-merge is enabled.

This COMMENT is not APPROVE. Independent exact-head APPROVE is still required. Do not self-approve. Do not mix into #74 or #92.