prime-agent support

[mbravorus]

prime-agent harness is built on top of pi and so can utilize pi plugins. however, due to architectural differences, prime-agent doesn't emit agent_settled, but only agent_end. I have patched directly over the installed plugin, but it's a bit of a hack. Would you be willing to consider a way to add some kind of conditional support for, perhaps, aliasing that event, or something to that tune?

[mbravorus]

this is how my one-line change plus descriptive comment look like in index.ts

 // Patched for Prime Agent (github.com/PrimeIntellect-ai/prime-agent), a pi fork
  // that does not emit "agent_settled". Prime's "agent_end" fires once per user
  // prompt when the agent is done responding, which is the same point in the
  // lifecycle "agent_settled" targets upstream. See prime-agent docs/extensions.md.
  pi.on("agent_end", async (_event, ctx) => {
    if (!state) return;
    finalizeRoot({ cancelled: false });
    await flush();
    if (ctx.hasUI) ctx.ui.setStatus("langfuse", "langfuse ✓ (trace sent)");
  });