fix(podspec): sync version to v0.15.6 + CI guard against tag drift

.github/workflows/podspec-version.yml

@@ -0,0 +1,24 @@
+name: Podspec Version Check
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  check-version:
+    name: Podspec matches tag
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Verify podspec version matches tag
+        run: |
+          TAG="${GITHUB_REF_NAME#v}"
+          PODSPEC=$(grep -E 'spec\.version\s*=' FluidAudio.podspec | sed -E 's/.*"([^"]+)".*/\1/')
+          echo "Tag version:     $TAG"
+          echo "Podspec version: $PODSPEC"
+          if [ "$TAG" != "$PODSPEC" ]; then
+            echo "::error file=FluidAudio.podspec::Podspec version ($PODSPEC) does not match tag ($TAG). Bump spec.version before tagging — consumers pinning by tag read this file."
+            exit 1
+          fi

FluidAudio.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |spec|
   spec.name         = "FluidAudio"
-  spec.version      = "0.12.2"
+  spec.version      = "0.15.6"
   spec.summary      = "Speaker diarization, voice-activity-detection and transcription with CoreML"
   spec.description  = <<-DESC
                        Fluid Audio is a Swift SDK for fully local, low-latency audio AI on Apple devices,