Add `--verbose` to batch shell completions

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Task summary

The batch command accepts -v, --verbose in src/index.ts, but the batch entry in SUBCOMMANDS inside src/commands/completion.ts omits it. Shell completion scripts therefore do not offer --verbose for batch.

Why this is a good first issue

This is a one-line fix in a single file. The existing completion test suite compares CLI --help output against generated scripts and should catch the mismatch once fixed.

Suggested files or areas

• src/commands/completion.ts — add --verbose / -v to the batch subcommand options
• src/index.ts — reference for the flag definition
• tests/completion-command.test.mjs — run tests to verify

Acceptance criteria

• batch subcommand options in completion.ts include -v, --verbose
• Generated bash, zsh, and fish completion scripts include --verbose for batch
• npm test passes (especially completion tests)

Extra context

The suggest subcommand already lists --verbose in SUBCOMMANDS; mirror that pattern for batch.