refactor(agent-actions): ♻️ Remove confidence field from AgentActionsDto and update validation logic and numeric transformations

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

@platform/codebase/@features/platform-api/src/common/numeric.transformer.ts

@@ -0,0 +1,17 @@
+import type { ValueTransformer } from 'typeorm';
+
+/**
+ * TypeORM transformer for PG `numeric` columns.
+ *
+ * Postgres returns numeric/decimal as `string` to preserve arbitrary precision.
+ * For bounded-precision domain values (e.g. confidence 0..1 at 3 decimals) the
+ * floating-point loss is below resolution, so we expose `number` on the entity
+ * and through DTOs. This keeps validation (@IsNumber, @Min, @Max) honest.
+ *
+ * DO NOT use for monetary or unbounded-precision fields — those must stay `string`.
+ */
+export const numericTransformer: ValueTransformer = {
+  to: (value: number | null | undefined): number | null | undefined => value,
+  from: (value: string | null | undefined): number | null | undefined =>
+    value === null || value === undefined ? value : Number(value),
+};

@platform/codebase/@features/platform-api/src/modules/agent-actions/agent-actions.dto.ts

@@ -69,7 +69,7 @@ export class CreateAgentActionDto {
   @Type(() => Date)
   approved_at?: Date | null;
 
-  @ApiProperty({ type: 'object', required: false, nullable: true, additionalProperties: {} })
+  @ApiProperty({ type: Object, required: false, nullable: true })
   @IsOptional()
   @IsObject()
   outcome_json?: Record<string, unknown> | null;

@platform/codebase/@features/platform-api/src/modules/agent-actions/agent-actions.service.ts

@@ -44,7 +44,6 @@ export class AgentActionsService {
       approved_by: input.approved_by ?? null,
       approved_at: input.approved_at ?? null,
       outcome_json: input.outcome_json ?? null,
-      confidence: input.confidence.toFixed(3),
     });
     const saved = await this.repo.save(entity);
     await this.cache.publish({