Why: T3 of the interaction foundation - unify button/card/slash/chat entries onto one command bus (D27) composing the Agent-Command library (D30), with danger=high commands gated behind inline confirm cards and every dispatch leaving the same audit envelope.
Evidence: go test green - cmdbus suite (four-entrance audit symmetry, high-danger confirm lifecycle incl. cancel/expiry/handler-reject, audit-unavailable yields unknown, plugin spec fail-closed, schema scalar validation) and server e2e (danger command via POST /api/commands -> confirm card -> card action confirm -> committed receipt -> audit query ordered accepted->committed); legacy /help,/new,/mock,/model,/profile contract preserved through the bus; store migration v7 command_audit (both dialects) with roundtrip test updated.
Impact: new internal/cmdbus (L1 package per D33), server routes POST /api/commands/{id} + GET /api/commands/audit + registry-driven GET /api/commands, postMessage chat-entrance dispatch when the intent gate matches a registered command, plugins host OnCommands overlay, module cards policy/modules/{cmdbus,cardsvc}.md; pending confirm state is process-local (documented limitation).
Refs: docs/proposals/2026-09-30-ui-inbox-command-workspace.md T3; task card feature/command-bus-r1
weichen
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