fix: update workflow references to .github/ and gitignore xcuserstate

Update AGENTS.md and docs/ci-cd-setup.md from .gitea/workflows to .github/workflows

Add *.xcuserstate to .gitignore

Remove tracked UserInterfaceState.xcuserstate from git (preserve on disk)

.gitignore

@@ -66,4 +66,7 @@ DerivedData/
 
 # XcodeGen generated — NOT in version control
 TabataGo.xcodeproj
-build/
+build/
+
+# Xcode user state
+*.xcuserstate

AGENTS.md

@@ -149,7 +149,7 @@ Complications : `TabataGoComplication`.
 
 ## 5. CI/CD
 
-### Workflow : `.gitea/workflows/pr-iphone-deploy.yml`
+### Workflow : `.github/workflows/pr-iphone-deploy.yml`
 
 **Trigger** : PR ouverte/synchronize/reopened sur `main`.
 **Runner** : label `macos` (auto-hébergé).

docs/ci-cd-setup.md

@@ -66,7 +66,7 @@ The workflow uses **automatic code signing**. Ensure:
 
 ## 4. Workflow Overview
 
-The workflow at `.gitea/workflows/pr-iphone-deploy.yml` triggers on PRs to `main`:
+The workflow at `.github/workflows/pr-iphone-deploy.yml` triggers on PRs to `main`:
 
 ```
 PR Opened / Updated