1.2.0

Add issue planning skills (#6)

* fix(skills): normalize skill heading hierarchy

Why:
- Bundled skills should expose the skill name as the first Markdown heading after frontmatter.
- Several existing skills started directly with section headings, which made the document hierarchy inconsistent.

What Changed:
- Added skill-name H1 headings to existing skill templates.
- Regenerated canonical and OpenAI-host materialized skill outputs.

Impact:
- Installed skills now present a consistent top-level heading without changing workflow instructions.

* feat(skills): add issue planning workflows

Why:
- SkillsPack needs reusable workflows for decomposing tasks into GitHub Issues and writing the resulting Issue bodies.
- The package smoke test must reflect the expanded development tier.

What Changed:
- Added issue-planner for single and parent-child Issue structure planning.
- Added issue-writer for GitHub Issue body creation, update, and gh-backed issue operations.
- Generated canonical and OpenAI-host materialized outputs for both skills.
- Updated package smoke test expectations for the new bundled skill count.

Impact:
- The development tier now includes 14 skills.
- Users can install issue-planner and issue-writer through skills-pack.

* docs(readme): list issue skills

Why:
- The README included skills table should match the bundled development skills.

What Changed:
- Added issue-planner and issue-writer to the included skills table.

Impact:
- Readers can discover the new Issue planning and writing skills from the package documentation.