Adopt UAPF v2.0.0 cornerstone naming: .bpmn.xml/.dmn.xml -> .bpmn/.dmn

UAPF-specification v2.0.0 mandates OMG-standard cornerstone extensions.
Renamed cornerstone files and updated references in README / docs /
processgit.mcp.yaml. Content of the BPMN/DMN files is unchanged.

docs/02-integration.md

@@ -8,7 +8,7 @@ This package validates against the UAPF v1.1 SSOT schemas:
 
 It conforms to UAPF Conformance Checklist §"Level 4 requirements":
 - ✓ uapf.yaml present
-- ✓ ≥1 BPMN file (`bpmn/semantic-document-analysis.bpmn.xml`)
+- ✓ ≥1 BPMN file (`bpmn/semantic-document-analysis.bpmn`)
 - ✓ `resources/mappings.yaml` present
 - ✓ `metadata/ownership.yaml` + `metadata/lifecycle.yaml` present
 - ✓ Cornerstones declared correctly (bpmn + resources)

processgit.mcp.yaml

@@ -13,6 +13,6 @@ server:
     endpoint of this repo.
 
 sources:
-  - path: "bpmn/semantic-document-analysis.bpmn.xml"
+  - path: "bpmn/semantic-document-analysis.bpmn"
     type: "xml"
     description: "BPMN - redact, extract, emit flow"