Add subagent foundation and runtime events

[jbreite]

Summary

• Adds the subagent foundation: profiles, registry/store/controller, AI SDK runner, lifecycle events, cost/depth/concurrency guardrails, control tools, and control-panel state.
• Moves the default agent tool surface toward Codemode-first subagents, with UpdatePlan replacing legacy Task/TodoWrite surfaces.
• Adds host-facing runtime primitives for Codex-style UIs: runtime event sinks, plan state, approvals, snapshots, and file-change events for Bash, Write, Edit, and Patch.
• Updates docs, examples, and API/reference pages to explain subagents, runtime events, AI SDK UI data parts, and the breaking migration path.

Breaking changes

• Removes the legacy Task and TodoWrite tools in favor of subagent control tools and UpdatePlan.
• Changes the default createAgentTools direction to Codemode/subagent-oriented runtime tools rather than maintaining legacy compatibility switches.

Validation

• bun run typecheck
• bun run check
• bun run check:ci
• bun run check:agents
• bun run test tests/context/runtime-events.test.ts
• Relevant suites for context/runtime/tools/subagents were run during implementation, including the broader runtime/tool suite that passed 277 tests.

Notes

• Linear follow-up for createAgentLoop: JZB-174

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bashkit-docs	Ready	Preview, Comment	Jun 16, 2026 12:25pm