[PROD-010-FIX] Python persistence parity alignment

[ktalpay]

Task ID: PROD-010-FIX
Lane: python
Status: merged
Agent: python-agent
Depends on: PROD-010
Blocks: PROD-011

Goal:
Review and merge the Python persistence parity-alignment changes that were left uncommitted before the final verdict branch.

Scope:

• Align Python persisted source-family identifiers with the parity contract.
• Preserve existing source-family table names.
• Validate explicit master_external_key handling required by persisted parity.
• Update configured cycle runner expectations if needed.
• Keep this separate from the final production-ready verdict.

Task-ID: PROD-010-FIX

[github-actions]

Agent Task Watcher updated task status.

Detected task: PROD-010-FIX
Merged PR: #636
Task issue status: status:ready -> status:merged

Downstream task update summary:

No dependent tasks were declared in Unblocks:.