commands/e2e.md contains incomplete pipeline test example

[AmbushData]

Problem

The commands/e2e.md file was updated from Playwright UI tests to pipeline tests, but the example code is incomplete.

Current State

Lines 1-100 contain:

• Good intro for E2E pipeline testing
• Test scenario description
• Started Python test code but cuts off mid-example

Expected State

Complete working example showing:

• Full test setup with fixtures
• Complete pipeline execution
• SCD2 validation (inserts, updates, expirations)
• Pandera schema validation
• Data quality assertions
• Performance checks

Impact

Medium - Users can't copy/paste working pipeline test example

Files Affected

• commands/e2e.md (needs completion of example starting ~line 70)