chore(cli): replace remaining bare as casts with blindCast (PR#746)

Clean up as we go — CodeRabbit flagged these in R5; I'd dismissed them as pre-existing (they predate this PR), but per repo policy bare `as` should not exist in production code. Three sites: the two `notOk(failure) as DbInitResult | DbUpdateResult` widenings in db-run.ts (failure-path return) and the `projectedSchema as never` opaque-IR pass-through in db-verify.ts.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Will Madden <madden@prisma.io>

Author: wmadden

packages/1-framework/3-tooling/cli/src/control-api/operations/db-run.ts

@@ -21,6 +21,7 @@ import {
   type PlannerError,
   planMigration,
 } from '@prisma-next/migration-tools/aggregate';
+import { blindCast } from '@prisma-next/utils/casts';
 import { ifDefined } from '@prisma-next/utils/defined';
 import { notOk, ok } from '@prisma-next/utils/result';
 import { CliStructuredError } from '../../utils/cli-errors';
@@ -332,7 +333,10 @@ function mapPlannerError(error: PlannerError): DbInitResult | DbUpdateResult {
       why: undefined,
       meta: undefined,
     };
-    return notOk(failure) as DbInitResult | DbUpdateResult;
+    return blindCast<
+      DbInitResult | DbUpdateResult,
+      'notOk(failure) is shape-compatible with both DbInitResult and DbUpdateResult; the union is the return type of the surrounding function'
+    >(notOk(failure));
   }
   if (error.kind === 'extensionPathUnreachable') {
     return buildRunnerFailure({
@@ -427,5 +431,8 @@ function buildRunnerFailure(args: {
     conflicts: undefined,
     ...ifDefined('warnings', args.warnings),
   };
-  return notOk(failure) as DbInitResult | DbUpdateResult;
+  return blindCast<
+    DbInitResult | DbUpdateResult,
+    'notOk(failure) is shape-compatible with both DbInitResult and DbUpdateResult; the union is the return type of the surrounding function'
+  >(notOk(failure));
 }

packages/1-framework/3-tooling/cli/src/control-api/operations/db-verify.ts

@@ -13,7 +13,7 @@ import {
   type VerifierOutput,
   verifyMigration,
 } from '@prisma-next/migration-tools/aggregate';
-import { castAs } from '@prisma-next/utils/casts';
+import { blindCast, castAs } from '@prisma-next/utils/casts';
 import { notOk, ok, type Result } from '@prisma-next/utils/result';
 import { CliStructuredError } from '../../utils/cli-errors';
 import {
@@ -186,7 +186,10 @@ export function createPerMemberVerifier<TFamilyId extends string, TTargetId exte
       // The family's `TSchemaIR` is opaque to migration-tools; the
       // aggregate verifier passes through whatever we hand it. The
       // family expects its own IR shape on the way back.
-      schema: projectedSchema as never,
+      schema: blindCast<
+        never,
+        'family TSchemaIR is opaque to migration-tools; projectedSchema is passed straight through'
+      >(projectedSchema),
       strict: verifyMode === 'strict',
       frameworkComponents,
     });