docs: mark monthly settlement read model implemented

docs/srs/Interface/req-022_monthly-settlement-read-model-foundation.md

@@ -1,6 +1,6 @@
 # REQ-022 Monthly settlement read-model foundation
 
-- Status: Approved
+- Status: Implemented
 - Type: Interface
 - Priority: High
 - Owner: 렛저장인
@@ -51,3 +51,11 @@ This REQ is the foundation slice split out of the deleted umbrella `REQ-022 Mont
 ## 6. Approval Notes
 
 - 2026-07-11 21:05 KST: Lead approval after user directed continued progression from the dcy-015 split. This first slice is approved independently because it is the foundation read model and does not introduce Streamlit UI, close persistence, MCP tools, or export side effects.
+
+
+## Implementation Evidence
+
+- PR: https://github.com/genichin/jarca-ledger-mcp/pull/5
+- Merge commit: c0580f7173bd3dd618e6fff0104e3f26a0d0dec9
+- Validation: local `pytest -q tests/test_service.py`, local `ruff check .`, local `pytest -q`, and PR CI all passed.
+- Scope note: Implemented read-model foundation only; UI/MCP/export/close persistence remain excluded.