refactor: consolidate skills

[yyyyaaa]

32 individual skills → 8 consolidated umbrella skills

  │         Skill         │ Refs │                                          Absorbed From                                           │
  ├───────────────────────┼──────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ constructive          │ 7    │ safegres, services-schemas, deployment, server-config, functions, cnc-execution-engine           │
  ├───────────────────────┼──────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ constructive-database │ 19   │ pgpm (+ 15 sub-refs), boilerplate-pgpm-init, boilerplate-authoring, github-workflows-pgpm        │
  ├───────────────────────┼──────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ constructive-graphql  │ 20   │ graphql-codegen (+ 14 sub-refs), graphql-query (+ 2), meta-forms, graphile-pgvector              │
  ├───────────────────────┼──────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ constructive-frontend │ 21   │ constructive-ui (+ 18 sub-refs), crud-stack, boilerplate-nextjs-app                              │
  ├───────────────────────┼──────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ constructive-testing  │ 12   │ pgsql-test (+ 7 sub-refs), drizzle-orm-test, supabase-test, drizzle-orm, pgsql-parser-testing    │
  ├───────────────────────┼──────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ constructive-ai       │ 9    │ pgvector-rag (+ 6 sub-refs), graphile-pgvector, github-workflows-ollama                          │
  ├───────────────────────┼──────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ constructive-tooling  │ 11   │ constructive-pnpm (+ 3 sub-refs), inquirerer-cli (+ 4), readme-formatting, planning-blueprinting │
  ├───────────────────────┼──────┼──────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ fbp                   │ 4    │ fbp-types, fbp-spec, fbp-evaluator, fbp-graph-editor                                             │
  └───────────────────────┴──────┴──────────────────────────────────────────────────────────────────────────────────────────────────┘

What's left for the private repo (constructive-private-skills): The same pattern should be applied there to consolidate the 25 private skills into 2 umbrella skills:
constructive-database (absorbing all constructive-db-* skills) and constructive-sdk (absorbing all constructive-sdk-*, constructive-tables, constructive-fields, etc.). That
would bring the total across both repos from 57 → ~10.