feat: show RankWeave rankings fail-closed (v0.75.0)

[seonghobae]

Buyer impact

After login, Rankings sits above Calendar. When RankWeave is disabled or the library is missing, Demo Analyst sees Rankings · RankWeave not available. When the in-process library accepts visible posts, accepted hits are listed by title. Click opens that post. A hidden post is omitted from every channel. Never invent a fused score or a theta.

• RankWeaveClient default transport raises RankWeaveNotAvailable.
• build_rankweave_client(disabled=False) uses LibraryRankWeaveTransport, which imports weighted_reciprocal_rank_fuse inside the call (Cormack et al. 2009 η = 60; Samuel et al. 2025 unequal weights).
• GET /api/rankings is post_read and returns unavailable + empty rankings when the port is down.
• Tests: default/disabled/missing-library/fuse-raises fail-closed, accepted hits, hidden post omitted, lexical ranks quote first, unknown envelope fail-closed, invented id dropped, frontend unavailable/accepted click.
• ADR 0024 + CHANGELOG 0.75.0 + ARCHITECTURE / AGENTS.

Exact head

e574dab on feat/rankweave-fusion-fail-closed-v0750.

Base: main @ 7464abb (merged #211 leftover pairs).

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 pairs landed as #211. TEPP fail-closed HTTP is #214. naruon mailbox is #217. ThreadWeave conversations are #219. Storybook increment is #123/#192. Keyverse IdP remains a later slice.

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2854664e-f51c-4262-9dd2-138f5bcb9d23

📥 Commits

Reviewing files that changed from the base of the PR and between 7464abb and e574dab.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (18)

• AGENTS.md
• ARCHITECTURE.md
• CHANGELOG.d/0.75.0-rankweave-fusion-fail-closed.md
• CHANGELOG.md
• README.md
• backend/app/config.py
• backend/app/main.py
• backend/app/ranking_ingestion.py
• backend/tests/test_config.py
• docs/adr/0024-rankweave-fusion-fail-closed.md
• frontend/package.json
• frontend/src/App.test.tsx
• frontend/src/App.tsx
• frontend/src/api.ts
• lineageweave/__init__.py
• lineageweave/rankweave_client.py
• pyproject.toml
• tests/test_rankweave_client.py

✨ Finishing Touches 💡 1

⚔️ Resolve merge conflicts 💡

• Resolve merge conflict in branch feat/rankweave-fusion-fail-closed-v0750

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/rankweave-fusion-fail-closed-v0750

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