[Bug] One invalid job in jobs.json causes entire workspace to fail #4835

Description

When jobs.json contains one invalid job (e.g., missing required field session_id), the entire workspace fails to start.

Evidence

ERROR | Failed to start service cron_manager: 1 validation error for JobsFile
jobs.14.dispatch.target.session_id - Field required

Expected Behavior

• Skip invalid jobs, load valid ones
• Log errors for invalid jobs
• Workspace should start with valid jobs only

Actual Behavior

• Entire workspace fails to start
• Console stuck loading indefinitely

Impact

One typo in one job breaks the entire system.