feat(agentswarm): M1+M3 — embeddable swarm runtime wrapping deepagents

@logicsrc/agentswarm: a self-hosted, framework-agnostic multi-agent runtime
that each app mounts on its own route (e.g. tronbrowser.dev/swarm).

M1 — core:
- createSwarmHandler(): Web (Request)=>Response handler, CORS + validation
- SwarmRunner: injectable engine interface
- createDeepAgentRunner(): deepagents (createDeepAgent) adapter; deepagents +
  @langchain/langgraph are optional peers loaded via dynamic import so the core
  builds/tests with zero heavy deps
- SwarmError + onRequest gate: seam for x402 metering / auth (402/403)

M3 — rubric self-check (deepagents RubricMiddleware is Python-only, so ported
at the runner layer):
- createRubricRunner(): grades output via an injectable judge and revises until
  it passes or maxIterations; passes through untouched when no rubric
- createLLMJudge(): cheap-model grader (lazy langchain initChatModel)

13/13 vitest pass; tsc clean; examples/server.mjs demo verified.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/agentswarm/src/index.ts

@@ -0,0 +1,19 @@
+/**
+ * @logicsrc/agentswarm — embeddable multi-agent swarm runtime, wrapping deepagents.
+ *
+ * Mount {@link createSwarmHandler} on a route in your own app (e.g. `/swarm`);
+ * back it with {@link createDeepAgentRunner} or any custom {@link SwarmRunner}.
+ */
+export { createSwarmHandler } from "./handler.js";
+export type { SwarmHandlerOptions } from "./handler.js";
+export { createDeepAgentRunner } from "./runner.js";
+export type { DeepAgentRunnerOptions } from "./runner.js";
+export { createRubricRunner, createLLMJudge } from "./rubric.js";
+export type {
+  RubricEvaluation,
+  RubricJudge,
+  RubricJudgeInput,
+  RubricRunnerOptions,
+  LLMJudgeOptions
+} from "./rubric.js";
+export * from "./types.js";