Add Seed Skills

Pipeline: seed-skills/<slug>/SKILL.md -> validator -> seed.ts upsert into the PROD database -> live catalog. These are PRODUCT catalog skills (Zod schema with testingTypes/languages), not Claude Code workflow skills; never confuse the two formats.

Format contract (parser reality)

packages/web/src/db/seed.ts parses frontmatter with regex, not a YAML library:

• Every value on ONE line; a wrapped description parses as truncated garbage
• Arrays INLINE ONLY: tags: [a, b, c]. YAML block lists (- item) parse as EMPTY arrays
• Zod limits: name 1-100 chars, description 10-500 chars, version semver, testingTypes >= 1, languages >= 1
• Allowed values come from packages/shared/src/constants/ (testing types, frameworks, languages, domains, agent slugs); check there before inventing one

Template (model the body on seed-skills/playwright-e2e/SKILL.md):