ci(desktop): add advisory relay-backed integration e2e lane

[oscarlehuu]

Problem

The Playwright integration project is the only desktop e2e lane against a real relay (Postgres + Redis + MinIO + buzz-relay). It includes Crew’s evidence-reactions-relay.spec.ts (#133 / PR #146) and inherited Buzz relay-backed specs. That lane lived only in the disabled upstream CI workflow; active nuncio-crew-ci.yml ran --project=smoke only. Relay-mode regressions (the D-042 class) were not exercised on PRs.

Approach

• Add Desktop E2E Integration to .github/workflows/nuncio-crew-ci.yml: two shards, same desktop path filter as smoke, services + schema/community seed + setup-desktop-test-data.sh + BUZZ_RECONCILE_CHANNELS=true + playwright test --project=integration.
• Each shard builds buzz-relay inline (self-contained; never a Gate hard dependency). 30m timeout absorbs cold cargo build; two shards keep wall-clock near upstream’s ~6–7m/shard once warm.
• Gating (D-047): advisory only — continue-on-error: true, not in gate.needs / JOB_RELEVANCE. Precedent: D-032 (Desktop Smoke E2E). Promotion to required is an explicit future founder decision.
• Drop stale tokens.spec.ts from integration testMatch (file gone).
• Contract test locks advisory posture; docs: DECISIONS.md D-047, CI.md, STATE.md, verification 0011.

Cost estimate

Upstream last run ~6m45s / ~6m17s per shard (pre-built relay). Crew shards also build relay → expect ~10–15m cold, closer to upstream with warm rust cache on main pushes. No secrets; ubuntu-latest only.

Verification

• Local: node --test desktop/src/testing/nuncio-crew-*.test.mjs (28 pass), actionlint, YAML parse.
• CI proof: this PR’s Desktop E2E Integration jobs must run (workflow path is in the desktop filter).

Risk

Advisory only — cannot block merge. Relay/service flakes surface as red checks without failing Gate.

Exclusions

• Does not make integration required.
• Does not fix known smoke baseline fails (relay-reconnect.spec.ts:617 — pre-disconnect message disappears from the timeline after a 260-message reconnect backfill #154, scroll-history.spec.ts:1281 — fast middle-page scroll settles with ~half the required mounted coverage #155, etc.).
• Does not re-enable inherited upstream CI workflow.

Fixes #147

[oscarlehuu]

Integration lane first-run evidence

Run: https://github.com/Nuncio-hq/crew/actions/runs/31567147317

Infrastructure (both shards): green — docker compose (Postgres/Redis/MinIO), cargo build --profile ci -p buzz-relay, schema + community seed, relay readiness with BUZZ_RECONCILE_CHANNELS=true, setup-desktop-test-data.sh, Playwright install/build all succeeded. The lane ran.

Shard	Duration	Playwright stats
1/2	25m23s	111 expected, 8 unexpected, 1 flaky, 1 skipped
2/2	16m57s	79 expected, 3 unexpected, 1 skipped

Spec failures are pre-existing product/spec drift, not CI plumbing:

• agents.spec.ts (shard 1): discard dialog missing, narrow-view overflow layout, catalog order/detail timeouts, share-to-catalog / community discovery / emoji avatar — inherited Buzz agent-catalog surface; not exercised in Crew since the upstream CI workflow was disabled.
• profile.spec.ts (shard 2): runtime-tab respond-to / agent-type count, inbox badge — same class of inherited drift.
• evidence-reactions-relay.spec.ts (shard 1): strict-mode violation on evidence-reaction-rejected (duplicate nodes) — same family as known smoke baseline evidence-reactions.spec.ts strict-mode; product locator scope, not seed/relay setup.

Gate: green (advisory lanes excluded by D-047 / D-032). Merging on Gate + documented pre-existing spec fails.