fx-cli-shape
Choose the mechanism and the names for any user-facing control in fx, and check changes against the agreed shape. Covers subcommands, arguments, flags and options, settings keys in settings.json and .fx.json, environment variables (FX_ env vars), slash commands, JSON output, and exit codes. Use when adding, renaming, deprecating, removing, or reviewing one, for example "add a flag", "add an option", "new env var", "make this configurable", "let users turn on X", "add a slash command", "deprecate this flag", "should this be a flag or a setting", or a diff that touches src/builtins/commands.zig, src/core/cli/, src/core/config/, or adds an FX_ env read. Not for parser internals or writing documentation prose.