feat(discovery): blocked countries filter and smoke subprocess fixes

Add blockedCountries in Settings so pipeline discovery drops jobs whose
location mentions listed countries (existing discovered rows are kept).
Document the feature, fix smoke tsconfig inheritance for nested extractors,
and run smoke via an absolute-tsconfig wrapper.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs-site/docs/extractors/arcdev.md

@@ -24,7 +24,7 @@ Curated remote hiring with explicit tooling-oriented feeds; many roles are open
 
 ## Common problems
 
-- **HTML changes:** If Arc ships a new payload shape, parsing may need an update; smoke-test with `npx tsx scripts/smoke-extractors.ts arcdev`, or run the full extractor suite with `npx tsx scripts/smoke-extractors.ts`.
+- **HTML changes:** If Arc ships a new payload shape, parsing may need an update; smoke-test with `npm run smoke:extractors -- arcdev`, or run the full suite with `npm run smoke:extractors`.
 - **`Arc talent network` employer:** Some Arc-managed rows omit a company name; the mapper uses that placeholder.
 
 ## Related pages