chore: add community files and PSGallery publish workflow

- Add CONTRIBUTING.md, SECURITY.md, CODE_OF_CONDUCT.md
- Add .gitattributes for line ending normalization
- Add GitHub issue templates (bug report, feature request)
- Add pull request template
- Add publish.yml workflow for PSGallery publication on tag push

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

CODE_OF_CONDUCT.md

@@ -0,0 +1,30 @@
+# Code of Conduct
+
+## Our Standards
+
+This project is committed to providing a welcoming and inclusive experience for everyone. We expect all participants to:
+
+- Be respectful and considerate in all interactions
+- Welcome newcomers and help them get started
+- Accept constructive feedback gracefully
+- Focus on what is best for the community and the project
+
+## Unacceptable Behavior
+
+- Personal attacks, insults, or derogatory comments
+- Publishing others' private information without permission
+- Any conduct that would be considered inappropriate in a professional setting
+
+## Scope
+
+This code of conduct applies to all project spaces including issues, pull requests, discussions, and any other communication channels associated with this project.
+
+## Enforcement
+
+Project maintainers are responsible for clarifying and enforcing standards of acceptable behavior. Instances of unacceptable behavior may be reported by contacting the project maintainer via GitHub.
+
+Maintainers may remove, edit, or reject contributions that do not align with this Code of Conduct, and may temporarily or permanently ban contributors for inappropriate behavior.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org/), version 2.1.