list templates + languages in 'kernel create --help'

[masnwilliams]

Summary

• `kernel create --help` now lists every supported language (with shorthand) and every template (with description + supported languages), so scripts and agents can pick `--language` / `--template` non-interactively without dropping into the prompt
• Help text is generated from `create.Templates` and `create.SupportedLanguages`, so it stays in sync as templates are added
• Added two `Example` lines showing the non-interactive flag form

before:
```
FLAGS
-l --language Language of the application
-t --template Template to use for the application
```

after:
```
Languages:
typescript (shorthand: ts)
python (shorthand: py)

Templates:
anthropic-computer-use Implements an Anthropic computer use agent [python, typescript]
browser-use Implements Browser Use SDK [python]
...
```

Test plan

• `go test -short ./cmd/... ./pkg/create/...` passes
• `kernel create --help` renders languages + templates list and examples
• sanity check the rendered help on a terminal with non-trivial width

---

Note

Low Risk
Low risk: changes are limited to CLI help/flag text generation plus a small pure function with unit tests; no scaffolding logic or data paths are modified.

Overview
kernel create help output is expanded and generated dynamically: the long description now lists all supported languages (including shorthands) and every template with its description and supported languages, and the command adds concrete non-interactive usage examples.

Flag help text is updated to hint available language values and direct users to --help for the template list. A new create.LanguageShorthand helper (with tests) supports rendering shorthand info alongside canonical language names.

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