Expands the plugin interface so slash command handlers can dispatch tool
calls through the registry with parent agent context wired up automatically.
This is the public API for plugins that need to orchestrate tools like
delegate_task — they call ctx.dispatch_tool() instead of reaching into
framework internals. The parent agent is resolved lazily from _cli_ref
when available (CLI mode) and omitted in gateway mode (tools degrade
gracefully).
Enables the hermes-deliver-plugin pattern where /deliver and /fanout
slash commands spawn subagents via delegate_task without touching the
agent conversation loop.
7 new tests covering: registry delegation, parent_agent injection from
cli_ref, gateway mode (no cli_ref), uninitialized agent, explicit
parent_agent override, kwargs forwarding, return value passthrough.
36b54afbc4