fix(cli): reject partially numeric line and hunk values

[fallintoplace]

Summary

Number.parseInt() silently truncated malformed hunk and line values such as 12abc, 1.5, and 1e3. Validate the complete token as decimal digits and require the result to be a safe positive integer before accepting it.

This covers --hunk, --old-line, and --new-line and adds the required patch changeset.

Testing

• bun test src/core/cli.test.ts
• bun test (1,072 passed, 22 skipped)
• bun run typecheck
• bun run lint
• bunx oxfmt --check src/core/cli.ts src/core/cli.test.ts .changeset/strict-cli-integers.md

[greptile-apps]

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