feat(hub): contain cross-tenant dispatch at Workbench seams - #723
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Guard the two Workbench-owned dispatch seams so a foreign-tenant allocation can never dispatch against an anchor run of another tenant: service-level tenant_mismatch (retryable, never terminal) wraps deployReadyAllocation, and the mail/signals dispatch routes answer 403 allocation_tenant_mismatch before enqueue/grant materialization. Documents the closed dispatchable-backend set in config. Fixes CL-7324
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Summary
Implements CL-7324 Option A (bench-owner, hub-provisioned, tenant-bound dispatch only; Workbench-side containment; vendor/intx untouched).
Guards the two Workbench-owned dispatch seams so a foreign-tenant allocation can never dispatch against an anchor run of another tenant:
tenant_mismatch(never terminal, never falls through to another tenant) with reportError context.allocation_tenant_mismatchon the mail/signals dispatch routes before enqueue/grant materialization.Zero edits under vendor/intx.
Verification
apps/hub/src/dispatch-tenant-guard.test.ts: 10 pass (tenant-mismatch retry, 403 on foreign allocation, no fall-through, fail-closed on missing anchor)bun test apps/hub/src: 114 pass / 0 fail across 23 filestsc --noEmitin apps/hub: clean; eslint on touched files: cleanFixes CL-7324