feat: show Keyverse identity fail-closed (v0.76.0)

[seonghobae]

Buyer impact

After login, Identity sits above Calendar. When Keyverse is unconfigured or GET /healthz is down, Demo Analyst sees Identity · Keyverse not available. When the published {status: ok} envelope is accepted, the panel names readiness only. Never invent an issuer, account, or token. Demo login stays on the synthetic Keycloak realm.

• KeyverseClient default transport raises KeyverseNotAvailable.
• build_keyverse_client(base_url=...) uses HttpKeyverseTransport, which GETs {base}/healthz through the http(s)-only client.
• HTTP 4xx/5xx, timeout, network, file://, and an unknown envelope fail closed.
• Extra healthz fields are dropped — never copied as an issuer or account.
• GET /api/identity is post_read and returns unavailable + ready=false when the port is down.
• Tests: default/empty-URL fail-closed, published ok accepted, unknown/non-ok envelope fail-closed, HTTP errors fail-closed, frontend unavailable/accepted (no invented login).
• ADR 0025 + CHANGELOG 0.76.0 + ARCHITECTURE / AGENTS.

Exact head

7cf1a7bcdf867f5066364168014b99918a4bf5f1 on feat/keyverse-idp-fail-closed-v0760.

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. RankWeave rankings are #220. Storybook increment is #123/#192. Registering LineageWeave as a Keyverse relying party remains a later slice.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8c020aa and 8a6c807.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (18)

• .env.example
• AGENTS.md
• ARCHITECTURE.md
• CHANGELOG.d/0.76.0-keyverse-identity-fail-closed.md
• CHANGELOG.md
• README.md
• backend/app/config.py
• backend/app/main.py
• backend/tests/test_config.py
• docs/adr/0025-keyverse-identity-fail-closed.md
• frontend/package.json
• frontend/src/App.test.tsx
• frontend/src/App.tsx
• frontend/src/api.ts
• lineageweave/__init__.py
• lineageweave/keyverse_client.py
• pyproject.toml
• tests/test_keyverse_client.py

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[seonghobae]

Exact head 7cf1a7b is waiting on independent current-head APPROVE. This COMMENT is not APPROVE and is not a merge. Do not self-approve. Do not invent an issuer, account, or token.

[seonghobae]

Rebased onto main@8c020aa (RankWeave v0.75.0). Version stays 0.76.0. Rankings and Identity both stay. Independent exact-head APPROVE still required. Do not mix into #74 or #92.