Add changeset for new AI tool integrations (#304)

Author: TabishB

.changeset/new-ai-tool-integrations.md

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+---
+"@fission-ai/openspec": minor
+---
+
+Add support for new AI tools with native slash command integration
+
+- **Gemini CLI**: Add native TOML-based slash command support for Gemini CLI with `.gemini/commands/openspec/` integration
+- **RooCode**: Add RooCode integration with configurator, slash commands, and templates
+- **Cline**: Fix Cline to use workflows instead of rules for slash commands (`.clinerules/workflows/` paths)
+- **Documentation**: Update documentation to reflect new integrations and workflow changes