Add prerequisite checks, uv sync on migrate, and command aliases

[gillespied]

Summary

• Prerequisite checks — idea-app init now validates all required tools (cdk, uv, git, docker, docker compose) upfront before creating anything. smoke-test checks docker/docker compose before running. Reports all missing tools at once with install hints. Fixes the confusing unknown shorthand flag: 'f' in -f error when the docker compose V2 plugin isn't registered.

• uv sync after migrate — idea-app migrate now runs uv sync after removing old [project.scripts] entries, so the old smoke_test/configure/provide_role entry points are cleaned up from the environment.

• Underscore aliases — smoke_test and provide_role work as aliases for smoke-test and provide-role. idea_app works as an alias for idea-app. Helps colleagues migrating from the old template where these used underscores.