✨ Support direct route and command composition

[cowboyd]

What does this PR do?

Route definitions currently require a routes() wrapper around every group of children which is tedious and contributes to rightward drift. Allow route(), command(), and extend() to accept child definitions directly, so nesting reads like the route tree:

Before

export const app = command(
  name("simulacrum"),
  description("Run and manage local service simulators."),
  version("1.0.0"),
  toggle(name("verbose")),
  routes(
    command(
      name("serve"),
      option(name("port"), schema(z.number().default(4000))),
    ),
    route(
      name("database"),
      routes(
        command(
          name("clean"),
          toggle(name("dryRun")),
        ),
        command(name("migrate")),
      ),
    ),
  ),
);

After

export const app = command(
  name("simulacrum"),
  description("Run and manage local service simulators."),
  version("1.0.0"),
  toggle(name("verbose")),
  command(
    name("serve"),
    option(name("port"), schema(z.number().default(4000))),
  ),
  route(
    name("database"),
    command(
      name("clean"),
      toggle(name("dryRun")),
    ),
    command(name("migrate")),
  ),
);

Breaking API change: remove the public routes() export. Replace inline routes(child, other) with direct children, or use extend(child, other) for reusable groups and dynamic resolver results. Update the README, examples, and existing tests to demonstrate the replacement API.

Type of change

• Bug fix
• Feature
• Refactor (no behavior change)
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• All tests pass (deno task test; this repository uses Deno)
• Files are formatted (deno fmt --check)
• I have added/updated tests for my changes (if applicable)
• I have added a changeset (@bomb.sh/router: minor)

AI-generated code disclosure

• This PR includes AI-generated code

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commit: 6f71bd0

[natemoo-re]

sweet! lgtm