Remove --language option from rhiza init CLI

[Copilot]

The --language CLI flag on rhiza init is removed. Language selection is now done via --template-repository (e.g. jebel-quant/rhiza-go for Go projects). The underlying init() implementation retains its language parameter.

src/rhiza/cli.py

• Dropped language: str = typer.Option(...) from init() signature
• Removed language=language from init_cmd() call
• Stripped all --language references from docstring/examples
• Simplified --template-repository help text

tests/test_commands/test_init_language.py

• Refactored TestInitWithLanguage → TestInitWithTemplateRepository; all tests now use template_repository= instead of language=
• Dropped test_init_unknown_language (no meaningful equivalent via template repository)
• Added @patch("...._check_template_repository_reachable") where explicit template_repository is now passed

REPOSITORY_ANALYSIS.md

• Updated two observations that referenced rhiza init --language go to reflect the template-repository approach

Before:

rhiza init --language go
rhiza init --language python --git-host github

After:

rhiza init --template-repository jebel-quant/rhiza-go --git-host github
rhiza init  # defaults to jebel-quant/rhiza (Python)

Original prompt

Remove the --language option/parameter from the rhiza init CLI interface in Jebel-Quant/rhiza-cli.

Requirements:

• Update src/rhiza/cli.py:
  • Remove the --language Typer option from the init command signature.
  • Remove all help/docstring text and examples that reference --language for init.
  • Ensure the call to init_cmd(...) no longer passes a language argument.
• Ensure behavior remains sensible after removal:
  • init_cmd should still be called with the remaining options.
  • Default template selection should follow current defaults (Python) unless overridden by --template-repository / --template-branch.
• Update documentation files to match the new CLI:
  • CLI.md and README.md should not mention --language for init.
• Update tests:
  • Remove or refactor tests that assert CLI support for --language.
  • Refactor language-specific tests (tests/test_commands/test_init_language.py) to test equivalent behavior via template repository selection (e.g., using template_repository="jebel-quant/rhiza-go" instead of language="go") or adjust expectations if the underlying command still supports language internally.
  • Ensure the full test suite passes.

Notes:

• Underlying implementation src/rhiza/commands/init.py may still accept a language parameter; it does not need to be removed unless required by test changes. The key goal is to remove it from the CLI interface.
• Keep backward compatibility considerations minimal; breaking the --language CLI flag is acceptable as requested.

This pull request was created from Copilot chat.

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