docs: fix broken link and improve agent reference

- Fix broken constitution.md link in detailed process section
- Add reference to supported AI agents list in upgrade guide

Commit-generated-by: GitHub Copilot <github.copilot@github.com>
Signed-off-by: Ashley Childress <6563688+anchildress1@users.noreply.github.com>

Author: anchildress1

README.md

@@ -550,7 +550,7 @@ This helps refine the implementation plan and helps you avoid potential blind sp
 You can also ask Claude Code (if you have the [GitHub CLI](https://docs.github.com/en/github-cli/github-cli) installed) to go ahead and create a pull request from your current branch to `main` with a detailed description, to make sure that the effort is properly tracked.
 
 >[!NOTE]
->Before you have the agent implement it, it's also worth prompting Claude Code to cross-check the details to see if there are any over-engineered pieces (remember - it can be over-eager). If over-engineered components or decisions exist, you can ask Claude Code to resolve them. Ensure that Claude Code follows the [constitution](memory/constitution.md) as the foundational piece that it must adhere to when establishing the plan.
+>Before you have the agent implement it, it's also worth prompting Claude Code to cross-check the details to see if there are any over-engineered pieces (remember - it can be over-eager). If over-engineered components or decisions exist, you can ask Claude Code to resolve them. Ensure that Claude Code follows the [constitution](base/memory/constitution.md) as the foundational piece that it must adhere to when establishing the plan.
 
 ### **STEP 6:** Generate task breakdown with /speckit.tasks
 

docs/upgrade.md

@@ -74,7 +74,7 @@ Run this inside your project directory:
 specify init --here --force --ai <your-agent>
 ```
 
-Replace `<your-agent>` with your AI assistant: `claude`, `gemini`, `copilot`, `cursor-agent`, `windsurf`, `qwen`, `opencode`, `codex`, `auggie`, `codebuddy`, `roo`, `kilocode`, or `q`.
+Replace `<your-agent>` with your AI assistant. Refer to this list of [Supported AI Agents](../README.md#-supported-ai-agents)
 
 **Example:**