feat(seo-schema-generator): merge site-extraction + source-to-schema into one skill

Unify the two schema-generation scenarios into a single slot-17 skill, both
feeding one claims register -> build -> validate(16) pipeline:

- Mode 1 (existing site): NEW scripts/extract_site_claims.py turns URLs / local
  HTML / a directory into a claims register. Existing JSON-LD -> CONFIRMED;
  title/OpenGraph -> PENDING (never auto-shipped). + site-extraction-methodology.md
  and bundled fixtures/site/ demo pages.
- Mode 2 (not-yet-published site): land the source-to-schema engine
  (build_schema_drafts.py, type_templates.json, claims/source registers, 3 refs,
  sample_claims.csv) from the Desktop builder.
- Rewrite SKILL.md (v2.0) around the two-mode framing; the claims register is the
  shared pivot. Only CONFIRMED, non-conflicting claims become schema; unfilled
  template slots are pruned, never emitted as placeholders.
- Retire the old template-fill generator (code/ + desktop/); update root CLAUDE.md.

Self-tested both chains end-to-end: Mode 2 sample -> build -> validate PASS (P0=0);
Mode 1 fixtures -> extract -> build -> validate PASS (P0=0), JSON-LD round-trips with
nested address intact. Fixed two adapter bugs (nested node promotion; relative-path URI).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -39,7 +39,7 @@ This is a Claude Skills collection repository containing:
 | 14 | seo-core-web-vitals | LCP, CLS, FID, INP metrics | "Core Web Vitals", "page speed" |
 | 15 | seo-search-console | GSC data analysis | "Search Console", "rankings" |
 | 16 | seo-schema-validator | Structured data validation | "validate schema", "JSON-LD" |
-| 17 | seo-schema-generator | Schema markup creation | "generate schema", "create JSON-LD" |
+| 17 | seo-schema-generator | JSON-LD generation — Mode 1 from existing site, Mode 2 from collected sources → claims register → drafts → validate (16) | "generate schema", "create JSON-LD", "source-to-schema", "schema from site" |
 | 18 | seo-local-audit | NAP, GBP, citations | "local SEO", "Google Business Profile" |
 | 19 | seo-keyword-strategy | Keyword expansion, intent, clustering, gaps | "keyword research", "keyword strategy" |
 | 20 | seo-serp-analysis | Google/Naver SERP features, competitor positions | "SERP analysis", "SERP features" |