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Introduce the `packages/subagent/` group and the abstract subagent seam — an agent delegating to a child agent — as a named-provider registry (`ctx.subagents`), unlike the single-implementation bash seam, so multiple transports (in-process, ACP, future A2A) coexist. This first PR lands the interface, a scripted test backend, and the model-facing tool, validated through the real cordis load path. - dsh-subagent: SubagentService registry + SubagentProvider/SubagentRun vocabulary + subagent/start|end events. Start-time capabilities (outputSchema, depthLimit, toolFilter) are checked pre-start and rejected loud; runtime capabilities (sendMessage, resume) are optional methods on SubagentRun. - dsh-subagent-mock (support): scripted provider for keyless, deterministic tests through the real Loader/export path. - dsh-tool-subagent: the model-facing `subagent` tool, config-bound to one provider; synchronous collect with try/finally dispose, signal->cancel bridging, and non-completed-stop-reason -> isError mapping. - Proposed RFC documenting the seam, the fork-vs-spawn-as-separate-backends decision, own-session isolation, synchronous-collect scope, and the deferral of background/poll/spill to a future unification with bash. - Wire the new group into tsconfigs, build refs, package hierarchy docs, the module graph, and the cordis catalog. RFC: docs/rfc/proposed/feature/2026-06-21-subagent-capability-seam.md