Remove references to "v4" throughout the code and documentation

docs/ui/README.md

@@ -25,7 +25,7 @@ When documents disagree, use this order:
 3. UI dependency and ownership boundaries: [UI contributor instructions](../../.github/instructions/ui.instructions.md).
 4. Durable failure behavior: [Error Handling invariant](../invariant/error_handling.md).
 5. Durable AI evidence behavior: [Digital Evidence and AI Processing Provenance](../invariant/ai_evidence_and_provenance.md).
-6. Data definitions and relationships: current models plus the [V4 schema](../ver4/schema_v4.md).
+6. Data definitions and relationships: current models plus the [schema contract](../schema.md).
 7. Implementation truth: current code and tests.
 
 If code intentionally changes accepted page behavior, update the corresponding page contract in the same change. If code accidentally differs, correct the implementation rather than rewriting intent to match a defect.
@@ -56,4 +56,4 @@ Each page contract contains:
 
 ## Current Baseline
 
-These contracts describe the current flattened V4 baseline.
+These contracts describe the current flattened Version 4 baseline.

docs/ui/pages/documents.md

@@ -120,7 +120,7 @@ Rules:
 - `src/transcription/services/workflows.py`
 - `src/transcription/ui/components/linked_people.py`
 - `src/transcription/ui/pages/print_preview_page.py`
-- `src/transcription/api/v4_print.py`
+- `src/transcription/api/print_api.py`
 - `tests/ui/test_documents_page.py`
 - `tests/services/test_document_service.py`