Add repository health files and configuration

[Copilot]

Repository Cleanup Plan

• Create GitHub issue templates for bugs and features
  • Create .github/ISSUE_TEMPLATE/bug_report.yml with bug icon (🐛)
  • Create .github/ISSUE_TEMPLATE/feature_request.yml with feature icon (✨)
  • Add appropriate contact links to templates
• Create Dependabot configuration
  • Create .github/dependabot.yml
  • Configure grouped updates for .NET dependencies
  • Configure grouped updates for GitHub Actions
  • Simplify configuration per review feedback
• Add CODE_OF_CONDUCT.md
  • Create standard Contributor Covenant code of conduct
  • Add appropriate contact information
  • Use GitHub Issues/maintainers for contact instead of email
• Add CONTRIBUTING.md
  • Document contribution guidelines
  • Reference development practices from AGENTS.md
  • Link to code of conduct
  • Convert to markdown link references
  • Use GitHub Issues/maintainers for contact instead of email
• Add SECURITY.md
  • Document security policy
  • Add vulnerability reporting process
  • Define supported versions
  • Convert to markdown link references
  • Use GitHub Security Advisories for vulnerability reporting
  • Update version table to "Latest" and "< Latest"
  • Remove specific day promises, use "promptly"
  • Remove email contacts, use GitHub features
  • Remove duplicate link references
• Update README.md with links to new files
  • Convert to markdown link references
  • Use absolute URLs (for NuGet package inclusion)
• Update .cspell.json with additional terms
• Update AGENTS.md
  • Add markdown link reference preference
  • Document README.md absolute URL requirement
  • Fix markdown line length issue (line 158)
  • Strengthen quality check guidance to be more mandatory
  • Fix markdown list formatting (MD032 - blank lines around lists)
• Address all code review feedback
• Fix all markdown linting issues

Original prompt

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This section details on the original issue you should resolve

<issue_title>Repository Cleanup</issue_title>
<issue_description>The following repository cleanup actions should be performed:

• Create issue templates for bugs and features with icons and appropriate contact links
• Create dependabot configuration to update dependencies with grouping of updates
• Add a standard CODE_OF_CONDUCT.md file
• Add a CONTRIBUTING.md file
• Add a SECURITY.md file</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Repository Cleanup #6

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[Malcolmnixon]

Please make sure to use markdown link references in all markdown files, and include that preference in the AGENTS.md file.

[Copilot]

Please make sure to use markdown link references in all markdown files, and include that preference in the AGENTS.md file.

Converted all markdown files to use link references and added this preference to AGENTS.md in commit c2f0963.

[Malcolmnixon]

Change "1.0.x" to "Latest" and "< 1.0" to "< Latest"

[Copilot]

Changed version table to "Latest" and "< Latest" in commit a04f31e.

[Malcolmnixon]

@copilot The Code Quality Check is failing for Markdown linting:
Error: AGENTS.md:158:121 MD013/line-length Line length [Expected: 120; Actual: 132] https://github.com/DavidAnson/markdownlint/blob/v0.36.1/doc/md013.md

Firstly please fix this issue, but secondarily consider ways to strengthen the AGENTS.md to try and persuade the agent to run all quality checks before considering its work done.

[Copilot]

@copilot The Code Quality Check is failing for Markdown linting:
`Error: AGENTS.md:158:121 MD013/line-length Line length [Expected: 120; Actual: 132] https://github.com/DavidAnson/markdownlint/blob/v...

Fixed the markdown line length issue on line 158 in commit 33eb24b. Also strengthened the quality check guidance in AGENTS.md by:

• Adding CRITICAL warning at the start of Pre-Finalization Quality Checks section
• Making linting checks MANDATORY with explicit warnings about CI failures
• Adding notes about CI build status verification
• Emphasizing that all quality checks must be completed before finalizing work

[Malcolmnixon]

@copilot The quality checks are STILL failing:
Error: AGENTS.md:276 MD032/blanks-around-lists Lists should be surrounded by blank lines [Context: "- These checks run automatical..."] https://github.com/DavidAnson/markdownlint/blob/v0.36.1/doc/md032.md

[Copilot]

@copilot The quality checks are STILL failing:

Fixed the MD032 markdown linting error in commit 7040199 by adding a blank line before the list following "Important Notes:".