feat(#137): create Forced Continuation Prompt System

Implement prompt generation system that produces continuation prompts
based on verification failures to force AI agents to complete work.

Service:
- generatePrompt: Complete prompt from failure context
- generateTestFailurePrompt: Test-specific guidance
- generateBuildErrorPrompt: Build error resolution
- generateCoveragePrompt: Coverage improvement strategy
- generateIncompleteWorkPrompt: Completion requirements

Templates:
- base.template: System/user prompt structure
- test-failure.template: Test fix guidance
- build-error.template: Compilation error guidance
- coverage.template: Coverage improvement strategy
- incomplete-work.template: Completion requirements

Constraint escalation:
- Attempt 1: Normal guidance
- Attempt 2: Focus only on failures
- Attempt 3: Minimal changes only
- Final: Last attempt warning

Priority levels: critical/high/normal based on failure severity

Tests: 24 passing with 95.31% coverage

Fixes #137

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

apps/api/src/continuation-prompts/interfaces/continuation-prompt.interface.ts

@@ -0,0 +1,24 @@
+export interface ContinuationPromptContext {
+  taskId: string;
+  originalTask: string;
+  attemptNumber: number;
+  maxAttempts: number;
+  failures: FailureDetail[];
+  previousOutput?: string;
+  filesChanged: string[];
+}
+
+export interface FailureDetail {
+  type: "test-failure" | "build-error" | "lint-error" | "coverage" | "incomplete-work";
+  message: string;
+  details?: string;
+  location?: string; // file:line
+  suggestion?: string;
+}
+
+export interface ContinuationPrompt {
+  systemPrompt: string;
+  userPrompt: string;
+  constraints: string[];
+  priority: "critical" | "high" | "normal";
+}