feat: wire BlueprintTypesPlugin into production schema build

[pyramation]

Summary

Wires the BlueprintTypesPlugin (from PR #857) into all production schema build paths so @oneOf typed blueprint input types are generated from live node_type_registry data at schema build time.

New file: fetch-registry.ts — queries metaschema_public.node_type_registry via a short-lived Pool({ max: 1 }) and returns NodeTypeRegistryEntry[]. Returns [] gracefully if the table doesn't exist (code 42P01) or on any other error.

Wiring changes (4 consumers updated):

• graphql/server/src/middleware/graphile.ts — production server; buildPreset is now async
• graphile/graphile-schema/src/build-schema.ts — codegen schema build path
• graphql/query/src/executor.ts — query executor
• graphql/explorer/src/server.ts — GraphQL explorer

Each consumer calls fetchNodeTypeRegistry(connectionString) before creating the preset and passes the result to BlueprintTypesPreset(nodeTypes).

This PR also includes the foundation from PR #857 (plugin, codegen @oneOf support, introspection isOneOf, tests).

Review & Testing Checklist for Human

• Single-flight pattern change in graphile.ts: buildPreset is now async and awaited on line 280, which means the fetchNodeTypeRegistry DB query runs before the creation promise is stored in the in-flight map (creating.set(key, ...)). Two simultaneous cache-miss requests for the same key will both run the registry query before coalescing. Verify this is acceptable (the query is idempotent and the schema is still cached after build).
• Silent failure in fetch-registry.ts: Any error other than 42P01 (undefined_table) logs a console.warn and returns [], meaning blueprint types silently disappear from the schema. Confirm this fail-open behavior is desired vs. failing the schema build.
• Pool-per-call overhead: fetchNodeTypeRegistry creates and tears down a new Pool({ max: 1 }) on every invocation. In production this only happens on cache misses, but verify this is acceptable vs. reusing an existing pool/connection.
• Indentation in graphile.ts lines 140–196: The returned object literal inside buildPreset has inconsistent indentation after the refactor to async. Cosmetic, but worth a quick look.
• End-to-end test plan: After merging both PRs (feat: @oneOf typed blueprint definitions with SuperCase node type keys #857 + this), run pnpm codegen against a database with node_type_registry populated. Verify the generated SDK types include BlueprintNodeInput as a discriminated union with SuperCase node type names as keys. Verify autocomplete works in an IDE.

Notes

• This PR merges the devin/1774002241-blueprint-typed-sdk branch (PR feat: @oneOf typed blueprint definitions with SuperCase node type keys #857) into a new branch off main. The net-new changes in this PR are: fetch-registry.ts and the 4 consumer wiring files.
• The graphql/test helper (graphile-test.ts) was intentionally not wired — tests that need blueprint types can pass BlueprintTypesPreset(nodeTypes) via the existing userPreset.extends mechanism.

Link to Devin session: https://app.devin.ai/sessions/5d550def7a314c97854ec12fa09dd4ca
Requested by: @pyramation

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