fix: deterministic test seeds for flaky boundary tests

.github/workflows/ci.yml

@@ -14,13 +14,10 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
-env:
-  DEVELOPER_DIR: /Applications/Xcode_15.2.app/Contents/Developer
-
 jobs:
   build-and-test:
     name: Build & Test
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
       - uses: actions/checkout@v4
 
@@ -39,6 +36,12 @@ jobs:
       - name: Install XcodeGen
         run: brew install xcodegen
 
+      - name: Show Xcode version
+        run: xcodebuild -version
+
+      - name: List available simulators
+        run: xcrun simctl list devices available | grep -E "iPhone|Apple Watch" | head -10
+
       - name: Generate Xcode Project
         run: |
           cd apps/HeartCoach
@@ -52,11 +55,14 @@ jobs:
           xcodebuild build \
             -project Thump.xcodeproj \
             -scheme Thump \
-            -destination 'platform=iOS Simulator,name=iPhone 15 Pro' \
+            -destination 'platform=iOS Simulator,name=iPhone 16 Pro' \
             -configuration Debug \
             CODE_SIGN_IDENTITY="" \
             CODE_SIGNING_REQUIRED=NO \
-            | xcpretty
+            2>&1 | tee /tmp/xcodebuild-ios.log | xcpretty
+      - name: Show Build Errors (if failed)
+        if: failure()
+        run: grep -A2 "error:" /tmp/xcodebuild-ios.log || echo "No error lines found"
 
       # ── Build watchOS ───────────────────────────────────────
       - name: Build watchOS
@@ -66,11 +72,14 @@ jobs:
           xcodebuild build \
             -project Thump.xcodeproj \
             -scheme ThumpWatch \
-            -destination 'platform=watchOS Simulator,name=Apple Watch Series 9 (45mm)' \
+            -destination 'platform=watchOS Simulator,name=Apple Watch Series 10 (46mm)' \
             -configuration Debug \
             CODE_SIGN_IDENTITY="" \
             CODE_SIGNING_REQUIRED=NO \
-            | xcpretty
+            2>&1 | tee /tmp/xcodebuild-watchos.log | xcpretty
+      - name: Show watchOS Build Errors (if failed)
+        if: failure()
+        run: grep -A2 "error:" /tmp/xcodebuild-watchos.log 2>/dev/null || echo "No watchOS error log"
 
       # ── Run unit tests ──────────────────────────────────────
       - name: Run Tests
@@ -80,12 +89,15 @@ jobs:
           xcodebuild test \
             -project Thump.xcodeproj \
             -scheme Thump \
-            -destination 'platform=iOS Simulator,name=iPhone 15 Pro' \
+            -destination 'platform=iOS Simulator,name=iPhone 16 Pro' \
             -enableCodeCoverage YES \
             -resultBundlePath TestResults.xcresult \
             CODE_SIGN_IDENTITY="" \
             CODE_SIGNING_REQUIRED=NO \
-            | xcpretty
+            2>&1 | tee /tmp/xcodebuild-test.log | xcpretty
+      - name: Show Test Errors (if failed)
+        if: failure()
+        run: grep -A2 "error:" /tmp/xcodebuild-test.log 2>/dev/null || echo "No test error log"
 
       # ── Coverage report ─────────────────────────────────────
       - name: Extract Code Coverage

.gitignore

@@ -37,6 +37,7 @@ ORCHESTRATOR_DRIVEN_IMPROVEMENTS.md
 CLAUDE.md
 PROJECT_HISTORY.md
 TESTING_AND_IMPROVEMENTS.md
+TODO.md
 
 # IDE
 .vscode/