Build a small Aster Python service and client in the current workspace.

Sources:
- https://sdk.getaster.now/docs/quickstart/python
- https://sdk.getaster.now/docs/bindings/python
- https://github.com/aster-rpc/aster-rpc

Read the linked Python quickstart before writing code. Use a published package
version compatible with that guide, and record the exact Aster and Python
versions you install. If the published package and guide disagree, identify the
mismatch and stop rather than inventing APIs or using private dependencies.

Create an isolated environment and a project containing request and response
types, a HelloService with a say_hello method, a producer, and a consumer. The
producer should print its Aster address. The consumer should take that address
as configuration, call the service with the name World, and print Hello, World!

Use the guide's development configuration for this local demonstration. Do not
describe it as a production authorization setup. Do not open public firewall
ports, commit credentials, or change machine-wide networking settings.

Start the producer locally, capture its actual address, and run the consumer
against it. Confirm the expected response using the real Aster connection. Add
a short README with installation, startup, consumer, and shutdown commands.
Record dependency versions so the project can be reproduced. Stop the processes
you started after verification unless I ask you to keep them running.

Report the files created, installed versions, commands run, observed response,
and any remaining problems. If network access, native package installation, or
execution is unavailable, report that limit; do not claim the example passed.

This prompt is a draft for the documentation design preview and has not yet been
validated in a coding harness.