feat: add slash commands (#1461)

.changeset/mode-filtering-slash-commands.md

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+---
+"task-master-ai": minor
+---
+
+Add operating mode filtering for slash commands and rules
+
+Solo mode and team mode now have distinct sets of commands and rules:
+- **Solo mode**: Local file-based storage commands (parse-prd, add-task, expand, etc.) plus common commands
+- **Team mode**: Team-specific commands (goham) plus common commands (show-task, list-tasks, help, etc.)
+
+Both modes share common commands for viewing and navigating tasks. The difference is:
+- Solo users get commands for local file management (PRD parsing, task expansion, dependencies)
+- Team users get Hamster cloud integration commands instead
+
+When switching modes (e.g., from solo to team), all existing TaskMaster commands and rules are automatically cleaned up before adding the new mode's files. This prevents orphaned commands/rules from previous modes.
+
+The operating mode is auto-detected from config or auth status, and can be overridden with `--mode=solo|team` flag on the `rules` command.

.changeset/warm-things-shake.md

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+---
+"task-master-ai": minor
+---
+
+Add Taskmaster slash commands for:
+
+- Roo
+- Cursor
+- Codex
+- Gemini
+- Opencode
+
+Add them with `task-master rules add <provider>`