feat(cli): introduce explicit run/exec subcommands to prevent typo-execution

Prevent the ambiguity where a mistyped subcommand was interpreted as the target
wrapped process.

- Introduce `run` and `exec` (alias) subcommands for launching wrapped processes.
- Promote internal test commands (`test-ns`, `test-args`, `test-lifecycle`) to explicit subcommands.
- Update CLI routing to return an error for unknown subcommands instead of falling back to the default execution path.
- Update `README.md` usage examples and all test suites to use the new subcommand structure.

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