Add seo-playbook research topic

Fetched and analyzed SEO playbook from madebyaris/rankmyseo repo.
Covers on-page parameters, off-page signals, Core Web Vitals (2026),
and GEO/AEO for AI answer engines. Includes sources.md with full
reference list, audit check ID mapping, and toolkit overview.

seo-playbook/sources.md

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+# Sources — SEO Playbook Research
+
+## Primary document
+
+- [SEO Playbook (raw markdown)](https://raw.githubusercontent.com/madebyaris/rankmyseo/refs/heads/main/docs/seo-playbook.md) — the document analyzed in this research topic
+
+## Toolkit
+
+- [RankMySEO GitHub repo](https://github.com/madebyaris/rankmyseo) — OSS SEO toolkit, Apache-2.0
+- [RankMySEO Wiki](https://github.com/madebyaris/rankmyseo/wiki) — architecture, roadmap, design decisions
+- npm scope: [@rankmyseo](https://www.npmjs.com/org/rankmyseo) (v0.3.x)
+- Author: Aris Setiawan (@madebyaris), Sidoarjo, Indonesia — [madebyaris.com](https://madebyaris.com)
+
+## Authoritative SEO sources (referenced in the playbook)
+
+- [Google Search Central](https://developers.google.com/search/docs) — official Google search documentation
+- [Google Search Essentials](https://developers.google.com/search/docs/essentials) — formerly Webmaster Guidelines
+- [Search Quality Rater Guidelines](https://developers.google.com/search/blog/2024/11/rater-guidelines-update) — definition of E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness)
+- [web.dev Core Web Vitals](https://web.dev/vitals/) — source of truth for LCP, INP, CLS
+- [Schema.org](https://schema.org/) — structured data vocabulary
+- [Bing Webmaster Guidelines](https://www.bing.com/webmasters/help/webmaster-guidelines-30fba232) — now relevant for ChatGPT Search
+
+## Practitioners and publications (referenced in the playbook)
+
+- *The Art of SEO* (Enge et al.) — book
+- [Backlinko](https://backlinko.com/) — blog
+- [Ahrefs Blog](https://ahrefs.com/blog/) — blog
+- [Moz Blog](https://moz.com/blog) — blog
+- Aleyda Solís — international SEO consultant
+- Lily Ray — E-E-A-T and algorithm update analysis
+- Marie Haynes — algorithm updates and quality rater perspectives
+
+## RankMySEO on-page audit checks (parameter → check ID)
+
+| Parameter | Target | Check ID |
+|-----------|--------|----------|
+| Title length | 50-60 chars, keyword front | `title-length` |
+| Meta description | 70-160 chars | `meta-description` |
+| Canonical URL | self-referencing / preferred URL | `canonical` |
+| Single H1 | exactly one | `single-h1` |
+| Subheading structure | ≥1 H2 | `heading-structure` |
+| Open Graph | og:title/description/image | `og-tags` |
+| Structured data | valid JSON-LD | `json-ld` |
+| Image alt text | every meaningful image | `image-alt` |
+| Content depth | not thin (≥ ~250 words) | `content-depth` |
+| HTML lang | declared | `lang-attribute` |
+| Mobile viewport | `<meta name=viewport>` | `viewport-meta` |
+| Indexable | no `noindex` | `robots-indexable` |
+| HTTPS | served over TLS | `https` |
+| LCP | < 2.5s | `cwv-lcp` |
+| INP | < 200ms | `cwv-inp` |
+| CLS | < 0.1 | `cwv-cls` |
+
+## Core Web Vitals thresholds (2026)
+
+| Metric | Good | Measures |
+|--------|------|----------|
+| LCP | < 2.5s | loading |
+| INP | < 200ms | responsiveness (replaced FID, March 2024) |
+| CLS | < 0.1 | visual stability |
+
+## Off-page parameters (practitioner reference, not in OSS v1)
+
+| Parameter | What good looks like |
+|-----------|---------------------|
+| Referring domains | steady growth of unique, relevant domains |
+| Link quality | high-authority, topically relevant sources |
+| Anchor text profile | mostly branded/natural; small exact-match % |
+| dofollow/nofollow mix | natural blend |
+| Link velocity | organic pace, no spikes |
+| Toxic links | monitored; disavow only clear spam |
+| Branded search | rising brand queries |
+| Brand mentions | linked + unlinked |
+| Google Business Profile | complete, verified, active |
+| Reviews | volume + rating + recency + responses |
+| NAP consistency | identical across citations |
+| Digital PR | earned coverage in authoritative media |
+
+## RankMySEO toolkit overview
+
+- **License**: Apache-2.0
+- **Status**: M0-M5 implemented, published on npm under `@rankmyseo` scope (v0.3.x)
+- **Stars**: 5 (as of 2026-07-29)
+- **Commits**: 24
+- **Created**: 2026-06-24
+- **Architecture**: Monorepo (pnpm + Turborepo), headless core + framework adapters
+- **Supports**: Node.js ≥ 20, Hono/Express/Next/Nitro/SvelteKit/Astro, SQLite + Postgres (Drizzle/Prisma/Kysely)
+- **Multi-tenant**: every row scoped by `tenantId` + `projectId`
+- **AI layer**: AI SDK tools + MCP server for dashboard customization (approval-gated)
+- **20+ packages** under `@rankmyseo` scope (core, storage, server adapters, react/vue/svelte, ui, cli, agent, scanner, collector, datasource, scheduler)