Codebase Observatory v0.1.0

First public CLI release.

Highlights:

• deterministic Git diff impact JSON
• changed JS/TS symbols and direct consumers
• file-level blast radius and nearby-test signals
• explainable review units and attention items
• staged, unstaged, renamed, deleted, and untracked working-tree support
• observatory --help and observatory --version

Install through Homebrew after the tap formula lands: brew install kraftaa/tap/observatory.