fix: keep adversarial review focus text out of option parsing

[kiwigitops]

Summary

• stop review option parsing once the first focus-text positional starts
• keep leading flags like --base main parseable for review commands
• add a parser regression test for focus text containing --model

Closes #333.

Tests

• node --test tests/args.test.mjs tests/commands.test.mjs
• npx tsc -p tsconfig.app-server.json --pretty false

[chatgpt-codex-connector]

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[kiwigitops]

Quick follow-up here. I fixed the dashed-positional case from review and added coverage for it. Happy to adjust the parser behavior further if needed.