docs(go): add Claude Code skill documentation

Documents the core CLI skill for Claude Code:
- Installation methods (project-based and global)
- Usage patterns (automatic and manual invocation)
- What Claude learns (testing, building, multi-repo)
- Command reference overview
- Customisation options

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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# Claude Code Skill
The `core` CLI includes a Claude Code skill that helps Claude use the correct commands when working in host-uk repositories.
## What It Does
The skill provides Claude with:
- Command quick reference for all `core` commands
- Decision tree for choosing the right command
- Common mistakes to avoid
- Best practices for testing, building, and releasing
## Installation
### Automatic (Project-Based)
When working in any host-uk repository that includes `.claude/skills/core/`, Claude automatically discovers and uses the skill.
### Global Install
Install the skill globally so it works in any project:
```bash
# If you have the repo cloned
cd /path/to/core
./.claude/skills/core/install.sh
# Or via curl
curl -fsSL https://raw.githubusercontent.com/host-uk/core/main/.claude/skills/core/install.sh | bash
```
This copies the skill to `~/.claude/skills/core/`.
## Usage
### Automatic Invocation
Claude automatically uses the skill when:
- Running tests in a Go project
- Building or releasing
- Working across multiple repos
- Checking CI status or issues
### Manual Invocation
Type `/core` in Claude Code to see the full command reference.
## What Claude Learns
### Testing
```
Wrong: go test ./...
Right: core test
Why: core test sets MACOSX_DEPLOYMENT_TARGET, filters linker warnings,
and provides colour-coded coverage output.
```
### Building
```
Wrong: go build
Right: core build
Why: core build handles cross-compilation, code signing, archiving,
and checksums automatically.
```
### Multi-Repo Workflows
```
Wrong: cd into each repo, run git status
Right: core health
Why: Aggregated view across all repos in one command.
```
## Command Reference
The skill includes documentation for:
| Category | Commands |
|----------|----------|
| Testing | `core test`, `core test --coverage`, `core test --json` |
| Building | `core build`, `core build --targets`, `core build --ci` |
| Releasing | `core release`, `core sdk` |
| Multi-Repo | `core health`, `core work`, `core commit`, `core push`, `core pull` |
| GitHub | `core issues`, `core reviews`, `core ci` |
| Environment | `core doctor`, `core setup`, `core search`, `core install` |
| PHP | `core php dev`, `core php artisan` |
| Containers | `core run`, `core ps`, `core stop`, `core logs`, `core exec` |
| Docs | `core docs list`, `core docs sync` |
## Customisation
The skill is a markdown file at `.claude/skills/core/SKILL.md`. You can:
1. **Fork and modify** - Copy to your own repo's `.claude/skills/` and customise
2. **Extend** - Add project-specific commands or workflows
3. **Override** - Project skills take precedence over global skills
## Troubleshooting
### Skill Not Loading
Check if the skill exists:
```bash
ls ~/.claude/skills/core/SKILL.md
# or
ls .claude/skills/core/SKILL.md
```
### Reinstall
```bash
rm -rf ~/.claude/skills/core
curl -fsSL https://raw.githubusercontent.com/host-uk/core/main/.claude/skills/core/install.sh | bash
```
## See Also
- [test command](test.md) - Run tests with coverage
- [build command](build.md) - Build projects
- [work command](work.md) - Multi-repo operations

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|---------|-------------|
| [`core docs`](cmd/docs.md) | Documentation management |
### Integrations
| Integration | Description |
|-------------|-------------|
| [Claude Code Skill](cmd/skill.md) | AI assistant integration for command guidance |
## Quick Start
```bash
@ -111,6 +117,7 @@ Core uses `.core/` directory for project configuration:
- [Setup](cmd/setup.md) - Clone repos from registry
- [Work](cmd/work.md) - Multi-repo operations
- [Docs](cmd/docs.md) - Documentation management
- [Claude Code Skill](cmd/skill.md) - AI assistant integration
### Reference
- [Configuration](configuration.md) - All config options