refactor(skills): migrate commands to skills directory structure

Move all 27 command .md files from commands/ to skills/*/SKILL.md
format. Claude Code 2.1.3+ merged commands and skills - both create
slash commands and work identically. Skills add optional features
like supporting files and automatic context loading.

- commands/ce/*.md -> skills/ce-*/SKILL.md
- commands/workflows/*.md -> skills/workflows-*/SKILL.md
- commands/*.md -> skills/*/SKILL.md
- Update plugin.json and marketplace.json descriptions
- Update CLAUDE.md directory structure docs
- Update deploy-docs and generate_command references

Fixes #116

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/compound-engineering/skills/generate_command/SKILL.md

@@ -0,0 +1,163 @@
+---
+name: generate_command
+description: Create a new custom slash command following conventions and best practices
+argument-hint: "[command purpose and requirements]"
+disable-model-invocation: true
+---
+
+# Create a Custom Claude Code Command
+
+Create a new skill in `.claude/skills/` for the requested task.
+
+## Goal
+
+#$ARGUMENTS
+
+## Key Capabilities to Leverage
+
+**File Operations:**
+- Read, Edit, Write - modify files precisely
+- Glob, Grep - search codebase
+- MultiEdit - atomic multi-part changes
+
+**Development:**
+- Bash - run commands (git, tests, linters)
+- Task - launch specialized agents for complex tasks
+- TodoWrite - track progress with todo lists
+
+**Web & APIs:**
+- WebFetch, WebSearch - research documentation
+- GitHub (gh cli) - PRs, issues, reviews
+- Playwright - browser automation, screenshots
+
+**Integrations:**
+- AppSignal - logs and monitoring
+- Context7 - framework docs
+- Stripe, Todoist, Featurebase (if relevant)
+
+## Best Practices
+
+1. **Be specific and clear** - detailed instructions yield better results
+2. **Break down complex tasks** - use step-by-step plans
+3. **Use examples** - reference existing code patterns
+4. **Include success criteria** - tests pass, linting clean, etc.
+5. **Think first** - use "think hard" or "plan" keywords for complex problems
+6. **Iterate** - guide the process step by step
+
+## Required: YAML Frontmatter
+
+**EVERY command MUST start with YAML frontmatter:**
+
+```yaml
+---
+name: command-name
+description: Brief description of what this command does (max 100 chars)
+argument-hint: "[what arguments the command accepts]"
+---
+```
+
+**Fields:**
+- `name`: Lowercase command identifier (used internally)
+- `description`: Clear, concise summary of command purpose
+- `argument-hint`: Shows user what arguments are expected (e.g., `[file path]`, `[PR number]`, `[optional: format]`)
+
+## Structure Your Command
+
+```markdown
+# [Command Name]
+
+[Brief description of what this command does]
+
+## Steps
+
+1. [First step with specific details]
+   - Include file paths, patterns, or constraints
+   - Reference existing code if applicable
+
+2. [Second step]
+   - Use parallel tool calls when possible
+   - Check/verify results
+
+3. [Final steps]
+   - Run tests
+   - Lint code
+   - Commit changes (if appropriate)
+
+## Success Criteria
+
+- [ ] Tests pass
+- [ ] Code follows style guide
+- [ ] Documentation updated (if needed)
+```
+
+## Tips for Effective Commands
+
+- **Use $ARGUMENTS** placeholder for dynamic inputs
+- **Reference CLAUDE.md** patterns and conventions
+- **Include verification steps** - tests, linting, visual checks
+- **Be explicit about constraints** - don't modify X, use pattern Y
+- **Use XML tags** for structured prompts: `<task>`, `<requirements>`, `<constraints>`
+
+## Example Pattern
+
+```markdown
+Implement #$ARGUMENTS following these steps:
+
+1. Research existing patterns
+   - Search for similar code using Grep
+   - Read relevant files to understand approach
+
+2. Plan the implementation
+   - Think through edge cases and requirements
+   - Consider test cases needed
+
+3. Implement
+   - Follow existing code patterns (reference specific files)
+   - Write tests first if doing TDD
+   - Ensure code follows CLAUDE.md conventions
+
+4. Verify
+   - Run tests: `bin/rails test`
+   - Run linter: `bundle exec standardrb`
+   - Check changes with git diff
+
+5. Commit (optional)
+   - Stage changes
+   - Write clear commit message
+```
+
+## Creating the Command File
+
+1. **Create the directory** at `.claude/skills/[name]/SKILL.md`
+2. **Start with YAML frontmatter** (see section above)
+3. **Structure the skill** using the template above
+4. **Test the skill** by using it with appropriate arguments
+
+## Command File Template
+
+```markdown
+---
+name: command-name
+description: What this command does
+argument-hint: "[expected arguments]"
+---
+
+# Command Title
+
+Brief introduction of what the command does and when to use it.
+
+## Workflow
+
+### Step 1: [First Major Step]
+
+Details about what to do.
+
+### Step 2: [Second Major Step]
+
+Details about what to do.
+
+## Success Criteria
+
+- [ ] Expected outcome 1
+- [ ] Expected outcome 2
+```