docs: update references from "Supported AI Agents" to "Supported AI Tools"

Claude Code, Cursor, Gemini CLI, and similar entries in the table are
AI coding tools/assistants, not autonomous agents. Renaming the section
to "Supported AI Tools" is more accurate.

Updated files:
- README.md: section header, TOC link, and table column header
- AGENTS.md: reference to the README section
- docs/upgrade.md: anchor link (#-supported-ai-agents → #-supported-ai-tools)

Author: MUHAMMEDHAFEEZ

AGENTS.md

@@ -105,7 +105,7 @@ Also update any function docstrings, examples, and error messages that list avai
 
 #### 3. Update README Documentation
 
-Update the **Supported AI Agents** section in `README.md` to include the new agent:
+Update the **Supported AI Tools** section in `README.md` to include the new tool:
 
 - Add the new agent to the table with appropriate support level (Full/Partial)
 - Include the agent's official website link

README.md

@@ -26,7 +26,7 @@
 - [🎨 Community Presets](#-community-presets)
 - [🚶 Community Walkthroughs](#-community-walkthroughs)
 - [🛠️ Community Friends](#️-community-friends)
-- [🤖 Supported AI Agents](#-supported-ai-agents)
+- [🤖 Supported AI Tools](#-supported-ai-tools)
 - [🔧 Specify CLI Reference](#-specify-cli-reference)
 - [🧩 Making Spec Kit Your Own: Extensions & Presets](#-making-spec-kit-your-own-extensions--presets)
 - [📚 Core Philosophy](#-core-philosophy)
@@ -234,9 +234,9 @@ Community projects that extend, visualize, or build on Spec Kit:
 
 - **[Spec Kit Assistant](https://marketplace.visualstudio.com/items?itemName=rfsales.speckit-assistant)** — A VS Code extension that provides a visual orchestrator for the full SDD workflow (constitution → specification → planning → tasks → implementation) with phase status visualization, an interactive task checklist, DAG visualization, and support for Claude, Gemini, GitHub Copilot, and OpenAI backends. Requires the `specify` CLI in your PATH.
 
-## 🤖 Supported AI Agents
+## 🤖 Supported AI Tools
 
-| Agent                                                                                | Support | Notes                                                                                                                                     |
+| Tool                                                                                 | Support | Notes                                                                                                                                     |
 | ------------------------------------------------------------------------------------ | ------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
 | [Qoder CLI](https://qoder.com/cli)                                                   | ✅      |                                                                                                                                           |
 | [Kiro CLI](https://kiro.dev/docs/cli/)                                               | ✅      | Use `--ai kiro-cli` (alias: `--ai kiro`)                                                                                                 |

docs/upgrade.md

@@ -76,7 +76,7 @@ Run this inside your project directory:
 specify init --here --force --ai <your-agent>
 ```
 
-Replace `<your-agent>` with your AI assistant. Refer to this list of [Supported AI Agents](../README.md#-supported-ai-agents)
+Replace `<your-agent>` with your AI assistant. Refer to this list of [Supported AI Tools](../README.md#-supported-ai-tools)
 
 **Example:**