Add GitHub workflows, changelog, package.json, and README updates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/pull_request_template.md

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+## What does this PR do?
+
+<!-- A clear description of what changed and why. -->
+
+## Component(s) affected
+
+- [ ] API Server
+- [ ] Console
+- [ ] Node SDK
+- [ ] Python SDK
+- [ ] Go SDK
+- [ ] Helm Chart
+- [ ] Documentation
+
+## How to test
+
+<!-- Steps to test this change against a local Docker Compose environment. -->
+
+1. ...
+
+## Related issues
+
+<!-- Link any related issues: Fixes #123, Relates to #456 -->
+
+## Checklist
+
+- [ ] I have tested my changes locally
+- [ ] My code follows the project's style guidelines
+- [ ] I have updated documentation if applicable
+- [ ] No secrets or credentials are included in this PR