Automated migration notification on workflow state load

[nikblanchet]

Description

When workflow-state.json is loaded in any command and auto-migration occurs (e.g., from legacy format to v1.0), notify the user once with a friendly message.

Current Behavior

Migration happens silently in the background via applyMigrations() call in WorkflowStateManager.loadWorkflowState(). Users have no visibility that their workflow state file was upgraded.

Proposed Behavior

Add a notification when auto-migration occurs:

Notice: Migrated workflow-state.json from legacy format to v1.0
  (This migration happens automatically. No action required.)

Analyzing ./src...

Implementation Approach

1. Add a flag to WorkflowStateManager to track if migration occurred
2. Return migration status from loadWorkflowState() (e.g., { state, migrated: boolean, from?: string, to?: string })
3. Display one-time notification in commands when migration detected
4. Migration info includes: source version, target version, timestamp

Benefits

• Users see transparency about schema upgrades
• No need to understand manual migration commands
• Builds trust in automated processes

Files to Modify

• cli/src/utils/workflow-state-manager.ts - Return migration metadata
• analyzer/src/utils/workflow_state_manager.py - Python equivalent
• All command files that call loadWorkflowState() - Check and display notification

Related Issues

• Implement workflow state schema migration utilities #375 - Schema migration utilities (parent feature)
• Add docimp status command to visualize workflow state #374 - docimp status command implementation

Estimated Effort

2-3 hours