feat: add PostgreSQL client, seed, and cloud function skills

[pyramation]

Summary

Adds agent skills for Constructive PostgreSQL tooling and cloud function development:

constructive-functions — Documents how to build and deploy Knative-style HTTP cloud functions, including the handler pattern, PGPM integration, database access with pg-cache, Docker builds, and Kubernetes deployment.

graphql-codegen — Documents the @constructive-io/graphql-codegen package for generating type-safe GraphQL SDKs (React Query hooks or Prisma-like ORM client) from database schemas.

pgsql-client — Documents PostgreSQL client utilities including ephemeral database creation, DbAdmin operations, PgClient query helpers, and RLS context management.

pgsql-seed — Documents seeding utilities for CSV, JSON, SQL data loading, and pgpm deployment.

pgsql-test-seeding (updated) — Now documents the preferred Direct Load Methods pattern for seeding test data.

Updates Since Last Revision

• Added new pgsql-client skill covering:

  • createEphemeralDb() for temporary databases (testing, code generation, CI)
  • DbAdmin for database administration (create, drop, templates, extensions)
  • PgClient query helpers with RLS context management

• Added new pgsql-seed skill covering:

  • CSV loading via COPY protocol (loadCsv, loadCsvMap, exportCsv)
  • JSON insertion (insertJson, insertJsonMap)
  • SQL file execution (loadSql, loadSqlFiles, execSql)
  • pgpm deployment (deployPgpm, loadPgpm)

• Updated pgsql-test-seeding skill:

  • Now documents two seeding patterns with Direct Load Methods as preferred
  • Added loadPgpm() to seeding methods overview
  • Added pgpm seeding section for zero-config usage

Review & Testing Checklist for Human

• Verify pgsql-client ephemeral API — The skill documents createEphemeralDb() from pgsql-client. Confirm this function exists and the return value matches (name, config, admin, teardown)
• Verify pgsql-seed function signatures — Confirm loadCsv, insertJson, loadSql, deployPgpm exist with documented signatures
• Verify Direct Load Methods on PgTestClient — The skill claims db.loadJson(), db.loadCsv(), db.loadSql(), db.loadPgpm() are available directly on PgTestClient
• Verify graphql-codegen ORM API — Confirm db.user.findMany(), db.mutation.login() patterns match actual generated code
• Verify pg-cache import path — The constructive-functions skill uses import { getPgPool, close } from 'pg-cache'

Suggested test: Try using createEphemeralDb() to create a temporary database, deploy a pgpm module with deployPgpm(), and verify the seeding methods work as documented.

Notes

A separate PR was created for the pgsql-client README update in the constructive repo: constructive-io/constructive#656

Link to Devin run: https://app.devin.ai/sessions/5edec0c962d04ee9bd15efc58ca2a050
Requested by: @pyramation

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