feat(ci): add path filtering to optimize CI workflow execution

Add intelligent path filtering to CI workflow to only run when files that could
impact the build are changed. This includes source code, tests, examples, package
configuration, build files, and CI configuration itself.

This optimization reduces unnecessary CI runs for documentation changes, README
updates, or other non-code modifications while ensuring all impactful changes
trigger the build.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: grdsdev

.github/workflows/ci.yml

@@ -4,9 +4,33 @@ on:
   push:
     branches:
       - main
+    paths:
+      - 'Sources/**'
+      - 'Tests/**'
+      - 'Examples/**'
+      - '*.swift'
+      - 'Package.swift'
+      - 'Package.resolved'
+      - '.github/workflows/ci.yml'
+      - 'Makefile'
+      - '*.xcodeproj/**'
+      - '*.xcworkspace/**'
+      - '.swiftpm/**'
   pull_request:
     branches:
       - "*"
+    paths:
+      - 'Sources/**'
+      - 'Tests/**'
+      - 'Examples/**'
+      - '*.swift'
+      - 'Package.swift'
+      - 'Package.resolved'
+      - '.github/workflows/ci.yml'
+      - 'Makefile'
+      - '*.xcodeproj/**'
+      - '*.xcworkspace/**'
+      - '.swiftpm/**'
   workflow_dispatch:
 
 concurrency: