v0.6.0

Snippet CRUD commands

Add CLI support for managing Wagtail snippets via the new wagtail-write-api snippet endpoints.

• New command group: wagapi snippets list|get|create|update|delete
• Schema flags: wagapi schema --snippets and wagapi schema --all for snippet type discovery
• Client methods: list_snippets, get_snippet, create_snippet, update_snippet, delete_snippet
• Snippet-aware example commands in schema detail output

This release aligns version numbering with wagtail-write-api — both projects now share minor versions to indicate API compatibility.