refactor(examples): use concurrently API for proper process cleanup

[ochafik]

Summary

• Replace custom spawn-based orchestration in examples/run-all.ts with concurrently's programmatic API
• Fixes zombie processes left behind when killing npm run examples:start with Ctrl+C

Problem

The custom spawn() + proc.kill() cleanup didn't kill grandchildren processes:

bun examples/run-all.ts
  └── npm run --workspace examples/foo start
        └── /bin/sh -c "bun serve.ts"
              └── bun serve.ts  ← ORPHANED on Ctrl+C!

Solution

Use concurrently's API which handles process tree killing via tree-kill internally:

const { result } = concurrently(commands, {
  prefix: "name",
  killOthersOnFail: command !== "build",
});

Test plan

• npm run examples:build works
• npm run examples:start + Ctrl+C → no zombie processes on ports 3101-3108

🤖 Generated with Claude Code

[pkg-pr-new]

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npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/ext-apps@128

commit: 1bb3bdc

[jonathanhefner]

Nice! 🧟‍♂️