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Document the dice notation grammar in roll --help master

The roll subcommand's help text stated only a one-line description. The full syntax, including keep/drop, reroll, and minimum suffixes, existed only as comments in src/dice.rs. Add it as clap after_help text, with an aligned example table, so a player can look up the notation without reading the source. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CUXjWo1zGFhdJUig1hcQGf


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