test(daemon): strengthen Vela workspace billing coverage

[AmyShang-alt]

Summary

Adds daemon-level integration coverage for Vela workspace billing flows and hardens four flaky full-suite regressions.

What changed

• Adds 30 Vela workspace and billing integration cases across the daemon Vela routes and wallet client.
• Covers workspace-aware wallet requests, subscription and balance state, team member quota handling, seats and invitations, auto-top-up configuration, and workspace isolation.
• Fixes the resume-on-failure fake Claude fixture so auth status is not counted as a generation attempt.
• Extends local timeouts only for three resource-sensitive daemon tests: restart idempotency, screenshot path traversal, and home-tree setup.

Why

Vela API/Web E2E coverage lives in powerformer/vela. These tests protect the Open Design daemon integration boundary so daemon callers continue to interpret Vela workspace and billing behavior correctly.

Validation

• tests/integrations/vela-wallet.test.ts and tests/integrations/vela.routes.test.ts: 117 passing tests
• Four repaired regression files: 38 passing tests
• Daemon TypeScript typecheck
• pnpm guard
• git diff --check

[lefarcen]

Closing as superseded by #6348, which landed the production hardening on feat/workspace-team as 722a1c855f83597db604b9a5e98e91e3ef27163f.

#6348 preserves the valid wallet-cache and proxy-boundary fixes from this draft, adds fail-closed protection for Connection-nominated Workspace scope, and includes deterministic red/green coverage. It intentionally excludes this draft's timeout widening and real sleeps.