Add seo-survival-kit (SEO rescue + Core Update recovery)

[maxschottke-spec]

Adds seo-survival-kit to the 🔌 Claude Plugins section.

What it is

Open-source Claude Code plugin with six SEO skills, built from a real e-commerce recovery case (mid-size German shop, −80 % Sistrix visibility after the March 2026 Core Update):

• seo-audit-free — free-tier health check (GSC + PSI + Lighthouse CLI + curl, zero paid APIs)
• post-core-update-recovery — Authority-First recovery framework, 4-phase plan with realistic 6–12 month timeline
• seo-outreach-report — 10-chapter A4 PDF generator for non-technical decision-makers (Sistrix + DataForSEO + PSI v5)
• channel-economics-analyzer — per-channel P&L for multi-marketplace shops
• competitor-deep-audit — DataForSEO-powered keyword-gap analysis
• psi-weekly-cron-baseline — automated PSI tracking with regression alerts

Why it might be a fit

• Zero npm dependencies — entire plugin is ~1000 lines of source. No package.json.
• Security-explicit — SECURITY.md with documented threat model. Two security passes already (v0.2.0 hardening + v0.2.1 data-quality fixes), both in git history.
• MIT licensed, no commercial motive.
• Tag-pinned install supported — README defaults to #v0.2.1 pinning.

Repo

https://github.com/maxschottke-spec/seo-survival-kit

Marked as draft — happy to address feedback before opening for review.