feat(#134): design Non-AI Quality Orchestrator service

Implement quality orchestration service to enforce standards on AI
agent work and prevent premature completion claims.

Components:
- QualityOrchestratorService: Core validation and gate execution
- QualityGate interface: Extensible gate definitions
- CompletionClaim/Validation: Track claims and verdicts
- OrchestrationConfig: Per-workspace configuration

Features:
- Validate completions against quality gates (build/lint/test/coverage)
- Run gates with command execution and output validation
- Support string and RegExp output pattern matching
- Smart continuation logic with attempt tracking
- Generate actionable feedback for failed gates
- Strict/lenient mode for gate enforcement
- 5-minute timeout, 10MB output buffer per gate

Default gates:
- Build Check (required)
- Lint Check (required)
- Test Suite (required)
- Coverage Check (optional, 85% threshold)

Tests: 21 passing with 85.98% coverage

Fixes #134

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/quality-orchestrator/dto/index.ts

@@ -0,0 +1,2 @@
+export * from "./validate-completion.dto";
+export * from "./orchestration-result.dto";

apps/api/src/quality-orchestrator/dto/orchestration-result.dto.ts

@@ -0,0 +1,33 @@
+import type { QualityGateResult } from "../interfaces";
+
+/**
+ * DTO for orchestration results
+ */
+export interface OrchestrationResultDto {
+  /** Task ID */
+  taskId: string;
+
+  /** Whether the completion was accepted */
+  accepted: boolean;
+
+  /** Verdict from validation */
+  verdict: "accepted" | "rejected" | "needs-continuation";
+
+  /** All gates passed */
+  allGatesPassed: boolean;
+
+  /** Required gates that failed */
+  requiredGatesFailed: string[];
+
+  /** Results from each gate */
+  gateResults: QualityGateResult[];
+
+  /** Feedback for the agent */
+  feedback?: string;
+
+  /** Suggested actions to fix issues */
+  suggestedActions?: string[];
+
+  /** Continuation prompt if needed */
+  continuationPrompt?: string;
+}

apps/api/src/quality-orchestrator/dto/validate-completion.dto.ts

@@ -0,0 +1,30 @@
+import { IsString, IsArray, IsDateString, IsNotEmpty, ArrayMinSize } from "class-validator";
+
+/**
+ * DTO for validating a completion claim
+ */
+export class ValidateCompletionDto {
+  @IsString()
+  @IsNotEmpty()
+  taskId!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  agentId!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  workspaceId!: string;
+
+  @IsDateString()
+  claimedAt!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  message!: string;
+
+  @IsArray()
+  @ArrayMinSize(0)
+  @IsString({ each: true })
+  filesChanged!: string[];
+}