T19-01 Phase 3: Transport and receipt integration

[edithatogo]

Track phase issue governed by the T19-01 Conductor plan.

Parent track: #550
Parent phase: #554
Plan: conductor/tracks/T19-01/plan.md

Implementation is not authorized by planning-only track creation.

• Add stored draft_body/published body round-trip inspection.
• Extend create/update receipts without changing existing confirmation semantics.
• Add CLI diagnostics and machine-readable remediation options.
• Verify backwards compatibility and consumer-driven contracts.
• Phase Verification & Checkpoint (see conductor/workflow.md).

[edithatogo]

Operational evidence: all six Season 1 table-bearing drafts were normalized in place, retain their draft IDs and exact schedules, and now contain zero table/tableHeader nodes. Receipts must distinguish that successful transport/state preservation from the still-failing rich browser-editor compatibility. See the remediation outcome comment on #550.

[edithatogo]

Completed via PR #601. Prepublish and browser workflow integrated with primary/auxiliary editor compatibility assessments and CLI schema compatibility commands.