Implement automatic remediation system with user approval workflow (sub-task 6.5)

- Created comprehensive RemediationManager with user approval workflows
- Added RemediationSuggestion with confidence levels and risk assessments
- Implemented Tauri commands for frontend integration with session management
- Added user preference learning system for validation decisions
- Created fix suggestion types including typos, capitalization, duplicates
- Implemented preview system with diff highlights and impact assessment
- Added session status tracking and remediation statistics

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: michael-borck

src-tauri/src/validation/built_in.rs

@@ -3,7 +3,6 @@ use crate::content::{GeneratedContent, ContentType};
 use anyhow::Result;
 use chrono::Utc;
 use std::collections::HashMap;
-use regex::Regex;
 
 /// Helper trait for string formatting
 trait StringFormatting {

src-tauri/src/validation/mod.rs

@@ -3,6 +3,8 @@ pub mod manager;
 pub mod built_in;
 pub mod factory;
 pub mod commands;
+pub mod remediation;
+pub mod remediation_commands;
 
 pub use validators::{
     Validator, ExportValidator, ValidationResult, ValidationConfig, ValidationIssue,
@@ -20,4 +22,14 @@ pub use built_in::{
 pub use commands::{
     ValidationService, validate_content_command, get_validation_progress_command,
     list_validators_command, get_validation_config_command, auto_fix_issues_command
+};
+pub use remediation::{
+    RemediationManager, RemediationConfig, RemediationSession, RemediationSuggestion,
+    SessionStatus, DecisionType, RemediationFixType, ConfidenceLevel, RiskLevel,
+    RemediationPreview, UserDecision, AppliedFix, UserPreferences, ImpactAssessment,
+    AlternativeFix, DiffHighlight, ChangeType
+};
+pub use remediation_commands::{
+    RemediationService, GenerateRemediationRequest, RemediationResponse,
+    ApplyFixRequest, UserDecisionRequest, SessionStatusResponse, RemediationStatistics
 };