feat(portfolios): add unified ledger history API

tests/release/test_release_contracts.py

@@ -50,7 +50,7 @@ def test_workflow_actions_are_commit_pinned_and_verify_version_is_project_derive
     assert 'RELEASE_VERSION=v0.1.3' not in verify
 
 
-def test_release_version_and_migration_contract_are_v013_head_0029():
+def test_release_version_and_migration_contract_are_v013_head_0030():
     project = (REPO / "pyproject.toml").read_text()
     config = (REPO / "app/core/config.py").read_text()
     migrations = sorted(
@@ -60,8 +60,8 @@ def test_release_version_and_migration_contract_are_v013_head_0029():
     )
     assert 'version = "0.1.3"' in project
     assert 'app_version: str = "0.1.3"' in config
-    assert len(migrations) == 29
-    assert migrations[-1].startswith("20260814_0029")
+    assert len(migrations) == 30
+    assert migrations[-1].startswith("20260820_0030")
 
 def test_dockerignore_is_deny_by_default_required_inputs_only():
     lines=(REPO/".dockerignore").read_text().splitlines(); assert lines[0]=="**"