feat: add @pgpmjs/migrate-client workspace package with zero codegen deps

[pyramation]

Summary

Adds sdk/migrate-client/ as a new workspace package (@pgpmjs/migrate-client) providing a typed GraphQL ORM client for the Constructive Migrate API (db_migrate schema).

The key design decision: the codegen generation script lives in sdk/constructive-sdk/scripts/generate-migrate-client.ts, not in migrate-client itself. This avoids circular dependencies — since pgpm/core will import @pgpmjs/migrate-client, having codegen as a devDep in migrate-client could create a cycle if codegen depends on anything in pgpm/core's dependency chain.

Changes:

• sdk/migrate-client/ — new workspace package with generated ORM, schema, tsconfig, README
• sdk/constructive-sdk/scripts/generate-migrate-client.ts — codegen script that reads from ../migrate-client/schemas/ and outputs to ../migrate-client/src/
• sdk/constructive-sdk/package.json — added generate:migrate-client script
• pgpm/core/package.json — added @pgpmjs/migrate-client workspace dependency
• pnpm-lock.yaml — updated (includes cosmetic reformatting by pnpm)

To regenerate the ORM: pnpm --filter @constructive-io/sdk run generate:migrate-client

Updates since last revision

• Stripped trgm fields from schema: Removed all *TrgmSimilarity computed fields, searchScore, fullTextSearch, TrgmSearchInput type, trgm* filter inputs, and *_TRGM_SIMILARITY_*/SEARCH_SCORE_* orderBy values from migrate.graphql. These were artifacts from an instance with pg_trgm enabled and not relevant to the base migrate API.
• Regenerated ORM from the cleaned schema — all trgm references are gone from generated code.
• Aligned tsconfig files with other SDK packages: tsconfig.json now extends ../../tsconfig.json; tsconfig.esm.json uses ESNext module + bundler moduleResolution.
• Updated README with logo, CI badge, license badge, version badge, and disclaimer footer matching other packages in the repo.

Review & Testing Checklist for Human

• Verify deps type correctness: The generated input-types.ts still types deps as string | null in some interfaces (e.g. SqlAction, SqlActionPatch), but the GraphQL schema declares deps: [String] (an array). The SqlActionInput interface correctly has deps?: string[]. This inconsistency suggests the codegen's array-type mapping still has a gap for non-input types. Check whether this blocks downstream usage in pgpm/core.
• Confirm pgpm/core usage: @pgpmjs/migrate-client is added as a dep to pgpm/core but no import/usage of it appears in this diff. Verify this is intentional (i.e., usage comes in a follow-up PR).
• Verify trgm stripping completeness: The schema was manually stripped of trgm fields rather than re-exported from a clean DB instance. Spot-check migrate.graphql for any remaining search-related artifacts that shouldn't be in the base schema.
• Test generation round-trip: Run pnpm --filter @constructive-io/sdk run generate:migrate-client from the workspace root and confirm the output in sdk/migrate-client/src/migrate/orm/ looks correct.

Notes

• The bulk of the pnpm-lock.yaml diff is cosmetic reformatting (multiline → single-line resolution fields), not substantive dependency changes.
• ORM was regenerated from main's latest codegen which includes the input-types-generator fixes from PRs fix(codegen): include TCondition in React hooks FindManyArgs + add VectorFilter to types.ts #818/fix(codegen): FindManyArgs TCondition slot fix + regenerate SDK from latest constructive-db #819.
• pnpm build passes cleanly, but no runtime/integration testing was performed against a live database.

Requested by: @pyramation
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