Remove temporary mortar wrappers from standalone examples

[richardkiene]

Context

As a workaround for #17, we're adding simple mortar wrappers to standalone examples (hello-http, hello-tcp) to enable external access during testing.

Task

Once #17 (default-external network for standalone services) is implemented:

1. Remove the mortar wrapper files from:

   • examples/hello-http/fabricks-mortar.toml
   • examples/hello-tcp/fabricks-mortar.toml

2. Update the example READMEs to show direct fabricks service run usage instead of fabricks mortar up

3. Verify the examples work as standalone services without mortar

Blocked By

• Add default-external network for standalone services with listen ports #17 - Add default-external network for standalone services with listen ports