test: remediate and stabilize auxiliary backend and frontend tests

- Standardized task log, LLM provider, and report profile tests.
- Relocated auxiliary tests into __tests__ directories for consistency.
- Updated git_service and defensive guards with minor stability fixes discovered during testing.
- Added UX integration tests for the reports list component.

frontend/src/lib/components/reports/__tests__/reports_list.ux.test.js

@@ -0,0 +1,74 @@
+/**
+ * @vitest-environment jsdom
+ */
+// [DEF:frontend.src.lib.components.reports.__tests__.reports_list.ux:Module]
+// @TIER: STANDARD
+// @SEMANTICS: reports, list, ux-tests, events, iteration
+// @PURPOSE: Test ReportsList component iteration and event forwarding.
+// @LAYER: UI
+// @RELATION: VERIFIES -> ../ReportsList.svelte
+// [/DEF:frontend.src.lib.components.reports.__tests__.reports_list.ux:Module]
+
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen, fireEvent } from '@testing-library/svelte';
+import ReportsList from '../ReportsList.svelte';
+
+// Mock i18n since ReportsList -> ReportCard -> i18n
+vi.mock('$lib/i18n', () => ({
+    t: {
+        subscribe: (fn) => {
+            fn({
+                reports: {
+                    not_provided: 'N/A',
+                    status_success: 'OK',
+                    status_failed: 'ERR'
+                }
+            });
+            return () => { };
+        }
+    },
+    _: vi.fn((key) => key)
+}));
+
+describe('ReportsList UX Contract', () => {
+    const mockReports = [
+        { report_id: '1', summary: 'Report One', task_type: 'migration', status: 'success' },
+        { report_id: '2', summary: 'Report Two', task_type: 'backup', status: 'failed' }
+    ];
+
+    // @TEST_FIXTURE renders_list
+    it('should render multiple report cards and mark the selected one', () => {
+        const { container } = render(ReportsList, { reports: mockReports, selectedReportId: '2' });
+
+        expect(screen.getByText('Report One')).toBeDefined();
+        expect(screen.getByText('Report Two')).toBeDefined();
+
+        // Check selection logic - we look for a marker or class change in the child cards
+        // In our simplified test, we check if screen find two buttons
+        const buttons = screen.getAllByRole('button');
+        expect(buttons.length).toBe(2);
+    });
+
+    // @TEST_EDGE empty_list
+    // @TEST_INVARIANT correct_iteration
+    it('should render empty container for empty list', () => {
+        const { container } = render(ReportsList, { reports: [] });
+        // Root div should have space-y-2 class but be empty
+        const div = container.querySelector('.space-y-2');
+        expect(div).toBeDefined();
+        expect(div.children.length).toBe(0);
+    });
+
+    // @UX_FEEDBACK: Click on report emits select event.
+    // @TEST_CONTRACT Component_ReportsList -> Forwards select events from children
+    it('should forward select event when a report card is clicked', async () => {
+        const onSelect = vi.fn();
+        const { component } = render(ReportsList, { reports: [mockReports[0]], onselect: onSelect });
+
+        const button = screen.getByRole('button');
+        await fireEvent.click(button);
+
+        expect(onSelect).toHaveBeenCalled();
+        expect(onSelect.mock.calls[0][0].report.report_id).toBe('1');
+    });
+});