Add szamlazz-invoicing skill

[socialproKGCMG]

Summary

Adds a new szamlazz-invoicing skill for Hungarian invoicing via the szamlazz.hu Agent API.

This skill lets Claude Code users issue, cancel (storno), and download Hungarian invoices with natural-language prompts — including NAV taxpayer auto-lookup, automatic partner caching, and proper Hungarian VAT calculation.

Component Details

• Name: szamlazz-invoicing
• Type: Skill
• Category: automation
• File: plugins/all-skills/skills/szamlazz-invoicing/SKILL.md

What it does

• Issues regular, proforma (díjbekérő), and storno invoices
• Auto-fetches company data from the Hungarian National Tax Authority (NAV) by tax number
• Caches partners locally for instant reuse
• Interactive first-run setup (3 questions, 30 seconds)
• Cross-platform (macOS, Linux, Windows) — Python 3.9+ only dependency
• All amounts calculated with Decimal / ROUND_HALF_UP precision
• 7 error codes translated with actionable Hungarian recovery steps

Plugin repository

github.com/socialproKGCMG/socialpro-szamlazz — MIT licensed, 61 tests, CI green.

Testing

• Tested with Claude Code via claude --plugin-dir
• All 61 unit tests pass
• No overlap with existing skills
• Follows CONTRIBUTING.md structure (frontmatter + sections)

Examples

/szamlazz állíts ki egy számlát Példa Kft.-nek 150 000 Ft-ról webfejlesztésről
/szamlazz sztornózd a SOC-2026-0042 számlát
/szamlazz díjbekérő Acme Ltd-nek 500 EUR-ról konzultációért