- Added inline hint support for slash commands with getInlineHint() method on SlashCommand and AutocompleteProvider interfaces.
- Added SubcommandDef interface for declarative subcommand definitions with name, description, and usage properties.
- Added subcommands and inlineHint properties to BuiltinSlashCommand interface for enhanced command configuration.
- Added getArgumentCompletions and getInlineHint functions to materialized slash commands for browser and mcp subcommand completion.
- Converted browser command to support subcommands (headless, visible) with inline hints.
- Converted mcp command to support 10 subcommands (add, list, remove, test, reauth, unauth, enable, disable, reload, help) with descriptions and usage hints.
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