chore: schema update (mar-26) + fix migrate-client index.ts preservation

[pyramation]

Summary

Combines the automated schema update from constructive-db@c72ec069 (PR #904) with a fix for the build-breaking bug it introduced (PR #905).

Schema changes (auto-generated):

• SqlMigration → SqlAction (rename across all SDK targets)
• FieldModule removed
• MigrateFile added
• Updated schemas, input types, ORM models, CLI commands, and React hooks accordingly

Build fix (generate-migrate-client.ts + package.json):

• The pregenerate:migrate-client script was deleting src/index.ts (the package entry point), and generateMulti only writes a root barrel for multi-target outputs — so the single-target migrate-client never got it back. This broke pgpm/export which imports @pgpmjs/migrate-client.
• Removed ../migrate-client/src/index.ts from the rimraf glob
• Added a post-codegen step in generate-migrate-client.ts to write the root barrel as a safety net

Updates since last revision:

• Explicitly restored sdk/migrate-client/src/index.ts (export * from './migrate') on this branch so the build fix takes effect immediately — not just on the next generate:migrate-client run.

Review & Testing Checklist for Human

• Verify the SqlMigration → SqlAction rename is complete. The CLI usage string in commands.ts is auto-generated and very long — confirm it references sql-action (not sql-migration). Also grep for any leftover SqlMigration / sqlMigration / sql_migration references in non-generated code (especially pgpm/export/src/export-graphql.ts which uses db.sqlAction.findMany).
• Verify the FieldModule removal is intentional and no code outside the generated SDK still references it.
• After merging, re-run the constructive-hub schema-propagation CI to confirm the full pipeline (pgpm deploy → SDL generation → codegen) passes end-to-end. This is the real integration test for the index.ts fix.

Notes

• The vast majority of this diff is auto-generated codegen output. Focus review on the two hand-written files: sdk/constructive-sdk/package.json (line 29) and sdk/constructive-sdk/scripts/generate-migrate-client.ts (new lines 9-10, 70-81).
• sdk/migrate-client/src/index.ts is now present in the branch (net zero diff vs. main since it was deleted by chore: update schemas from constructive-db (mar-26-139am) #904 and restored). The generate script safety net ensures future regenerations won't lose it again.
• The path.resolve(OUTPUT_DIR, 'index.ts') in the generate script resolves relative to sdk/constructive-sdk/ (the pnpm working directory), so it should correctly target sdk/migrate-client/src/index.ts.

Link to Devin session: https://app.devin.ai/sessions/6c7e6bf137a34786827fc77a43a7a84a
Requested by: @pyramation

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring