Document issue-based content workflow in copilot instructions

[Copilot]

Adds blog post documenting the GitHub Issues → Copilot → publication workflow for content management. Updates copilot instructions to codify the 6-step process.

Changes

• New post: content/posts/managing-blog-posts-with-github-copilot.md

  • Issue-based workflow mechanics (status tracking, auto-closure)
  • GitHub API integration details
  • Draft-first publication pattern with TOML frontmatter

• Copilot instructions: Added "Content Creation Workflow with GitHub Issues" section

  • Issue creation → assignment → draft → review → publish → close
  • Merged with existing content attribution and project status rules
  • TOML frontmatter templates for Hugo compatibility

Example workflow

# Step 1: Create issue with "blog post" label
# Step 2: Assign to copilot, moves to "In Progress"
# Step 3: Generate draft
+++
date = '2026-02-04T16:25:00-05:00'
draft = true
title = 'Post Title'
+++
# Step 4: Review content
# Step 5: Publish by setting draft = false
# Step 6: Merge → issue auto-closes, moves to "Done"

Deployment triggers automatically on merge to main via existing GitHub Actions workflow.

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