Remove empty frontmatter from documentation examples

[Copilot]

Documentation examples contained empty frontmatter blocks (---\n---) that serve no purpose and clutter the examples.

Changes

• Removed 7 instances of empty frontmatter from README.md examples
• Preserved the non-empty frontmatter example demonstrating actual usage (env: development, language: go)

Example

Before:

cat > .coding-agent-context/prompts/my-task.md << 'EOF'
---
---
# Task: {{ .taskName }}

Please help me with this task.
EOF

After:

cat > .coding-agent-context/prompts/my-task.md << 'EOF'
# Task: {{ .taskName }}

Please help me with this task.
EOF

Original prompt

In the docs, remove frontmatter where it is empty.

---

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