Add shell completion support for bash, zsh, and fish shells

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Title: Add shell completion support for bash, zsh, and fish shells

Description: Extend the CLI in src/lib/main.js with a new completion subcommand that outputs valid shell completion scripts for supported shells. This feature will demonstrate an advanced CLI capability for our template and improve user experience by enabling tab completion.

Acceptance Criteria:

1. Given process.argv = ['node', 'src/lib/main.js', 'completion', 'bash'], when main() is invoked, then it must print a valid bash completion script (e.g., complete -C 'repository0' repository0) to stdout and exit with code 0.
2. Given process.argv = ['node', 'src/lib/main.js', 'completion', 'zsh'], when main() is invoked, then it must print a valid zsh completion snippet (e.g., #compdef repository0 _arguments '*') to stdout and exit with code 0.
3. Given process.argv = ['node', 'src/lib/main.js', 'completion', 'fish'], when main() is invoked, then it must print a valid fish completion function (e.g., complete -c repository0 -f -a "(repository0 completion fish)") to stdout and exit with code 0.
4. Given a missing or unsupported shell argument (e.g., completion or completion foo), when main() is invoked, then it must write a usage message Usage: completion [bash|zsh|fish] to stderr or stdout, and exit with a non-zero code.
5. All new behaviors must be covered by unit tests in tests/unit/main.test.js and pass under npm test.
6. Documentation in README.md under the CLI Usage section must include examples for invoking the completion subcommand and instructions on how to source the output for each shell.

Implementation Tasks:

• Update src/lib/main.js to parse the completion subcommand and dispatch based on the shell argument.
• Implement functions to generate minimal valid completion scripts for bash, zsh, and fish.
• Enhance tests/unit/main.test.js with test cases covering each criterion above.
• Update README.md to document usage and enablement steps for shell completion.

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This issue has been reviewed and marked as 'ready'. The description has been updated with testable acceptance criteria, and relevant library documents ([], 0 in total) have been added as comments.

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Add shell completion support for bash, zsh, and fish, along with tests and documentation

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https://github.com/xn-intenton-z2a/repository0/tree/agentic-lib-issue-2093

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agentic-lib-issue-2093 has Reached the limit of 2 attempts with 2 attempts.