Update branch prefix to use claps env feature

[kyle-rader]

Add a --prefix CLI option to lk new to set the branch name prefix, leveraging Clap's env feature for LOKI_NEW_PREFIX.

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Note

Adds an optional --prefix flag (and LOKI_NEW_PREFIX via Clap env) to lk new, updates help/docs, and bumps version to 0.9.3.

• CLI:
  • new subcommand: add optional --prefix (also reads LOKI_NEW_PREFIX via Clap env) and pass it into new_branch.
  • Update new_branch signature to accept prefix: Option<&str> and adjust prefix handling/logging.
• Docs:
  • Refresh README.md and help text to document --prefix and LOKI_NEW_PREFIX usage.
• Build/Config:
  • Enable Clap env feature in Cargo.toml.
  • Bump crate version from 0.9.2 to 0.9.3.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[kyle-rader]

🚀