feat(new)!: generate main.cc for bin and lib for library

[ken-matsui]

No description provided.

[chatgpt-codex-connector]

💡 Codex Review

cabin/src/Cmd/New.cc

Lines 67 to 69 in 20e9b9b

	namespace {1} {{
	void hello_world();
	}} // namespace {1}

Hyphenated package names generate uncompilable library code

The new library template writes namespace {1} directly into the generated header/implementation and the implementation now includes that header. Package names validated by validatePackageName are allowed to contain dashes, so running cabin new --lib my-lib will emit namespace my-lib { ... }, which is ill‑formed C++ and causes the generated project to fail to compile. Previously the default lib.cc stub compiled even for hyphenated names because it didn’t reference the namespace; this change introduces a compile-time failure for a valid input.

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[ken-matsui]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

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