chore: add governance and contribution templates

Author: Thomas Tupper

.github/CODEOWNERS

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+* @ttupper92618

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a defect
+labels: bug
+---
+
+## What happened?
+
+## Expected behavior
+
+## Repro steps
+1.
+2.
+3.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Propose an enhancement
+labels: enhancement
+---
+
+## Problem
+
+## Proposal
+
+## Alternatives

.github/branch-protection.md

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+# Recommended branch protection
+
+- Require pull request before merging
+- Require status checks to pass
+- Require linear history
+- Block force pushes

.github/pull_request_template.md

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+## Summary
+
+## Changes
+- 
+
+## Validation
+- [ ] Local test run
+- [ ] CI passing

CHANGELOG.md

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+# Changelog
+
+## 0.1.0 - scaffold
+- Initial repository scaffold

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+This project follows the Contributor Covenant.
+
+Be respectful, inclusive, and constructive.

CONTRIBUTING.md

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+# Contributing
+
+## Workflow
+1. Create a feature branch from `main`.
+2. Open a PR with a clear summary and test notes.
+3. Require passing CI before merge.
+
+## Commit style
+Use conventional commits when possible (`feat:`, `fix:`, `chore:`).

SECURITY.md

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+# Security Policy
+
+Please report vulnerabilities privately to the maintainers before public disclosure.
+
+- Do not open public issues for active vulnerabilities.
+- Include reproduction steps and impact.

VERSIONING.md

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+# Versioning
+
+This project follows SemVer.
+- MAJOR: incompatible API changes
+- MINOR: backward-compatible features
+- PATCH: backward-compatible fixes