Implement path-based triggers to prevent spurious publish/release (#69)

Problem: Any push to master triggered publish and release workflows,
including enhancement PRs that only changed .github/ files or documentation.

Solution: Path-based triggers that only publish when SDK code changes.

Changes:
- Created on-push-master.yml with explicit path filters for SDK files
- Updated publish.yml: added workflow_call trigger, removed push trigger
- Updated release.yml: added workflow_call trigger, removed push trigger

Behavior after this change:
✅ SDK file changes (api.ts, package.json, etc.) → triggers publish/release
✅ Workflow changes (.github/**) → does NOT trigger publish/release
✅ Documentation changes (README.md) → does NOT trigger publish/release

This allows safe merging of workflow enhancements, config updates, and
documentation without triggering package releases.

Refs: Multi-version-POC-blockers.md Phase 1

Co-authored-by: Genevieve Nuebel <genevieve.nuebel@mx.com>

Author: Gvieve

.github/workflows/on-push-master.yml

@@ -0,0 +1,27 @@
+name: On Push to Master
+
+on:
+  push:
+    branches: [master]
+    paths:
+      # Root-level SDK files (current structure)
+      # Only trigger publish/release when SDK code changes
+      - 'api.ts'
+      - 'base.ts'
+      - 'common.ts'
+      - 'configuration.ts'
+      - 'index.ts'
+      - 'package.json'
+      - 'tsconfig.json'
+      - 'tsconfig.esm.json'
+      - 'dist/**'
+      - '.openapi-generator/**'
+
+jobs:
+  Publish:
+    uses: ./.github/workflows/publish.yml
+    secrets: inherit
+
+  Release:
+    uses: ./.github/workflows/release.yml
+    secrets: inherit

.github/workflows/publish.yml

@@ -1,11 +1,10 @@
 name: Publish
 
 on:
-  push:
-    branches: [master]
   repository_dispatch:
     types: [publish_sdk]
   workflow_dispatch:
+  workflow_call:
 
 jobs:
   Publish:

.github/workflows/release.yml

@@ -1,10 +1,9 @@
 name: Release
 
 on:
-  push:
-    branches: [ master ]
   repository_dispatch:
     types: [release_sdk]
+  workflow_call:
 
 jobs:
   Release: