chore: cleanup tracked junk + commit remaining test fixes

.gitignore:
- Add .duckdb semantic index binaries
- Add .axiom/temp/ pytest artifacts
- Add e2e_*.png screenshots
- Remove tracked package-lock.json (already in gitignore)

Untrack junk (git rm --cached):
- 3 duckdb binary index files
- 18 pytest temp artifacts
- 12 e2e screenshots
- package-lock.json

Test fixes (decomposition follow-up):
- executor test mock paths
- orchestrator test mock paths
- preview test mock paths
- orthogonal fixes test mock paths
- git_manager integration test
- settings_page integration test
- settings-utils fix

frontend/src/components/git/__tests__/git_manager.unfinished_merge.integration.test.js

@@ -1,41 +1,42 @@
 // #region GitManagerUnfinishedMergeIntegrationTest:Module [TYPE Function]
 // @SEMANTICS: git-manager, unfinished-merge, dialog, integration-test
 // @PURPOSE: Protect unresolved-merge dialog contract in GitManager pull flow.
-// @LAYER: UI Tests
 // @RELATION: DEPENDS_ON -> [GitManager]
 
 import { describe, it, expect } from 'vitest';
 import fs from 'node:fs';
 import path from 'node:path';
 
-const COMPONENT_PATH = path.resolve(
-  process.cwd(),
-  'src/components/git/GitManager.svelte',
-);
+const MANAGER_PATH = path.resolve(process.cwd(), 'src/components/git/GitManager.svelte');
+const UTILS_PATH = path.resolve(process.cwd(), 'src/services/git-utils.js');
+const HANDLER_PATH = path.resolve(process.cwd(), 'src/components/git/useGitManager.js');
+const DIALOG_PATH = path.resolve(process.cwd(), 'src/components/git/GitMergeDialog.svelte');
 
 describe('GitManager unfinished merge dialog contract', () => {
   it('keeps 409 unfinished-merge detection and WebUI dialog recovery flow in pull handler', () => {
-    const source = fs.readFileSync(COMPONENT_PATH, 'utf-8');
+    const utils = fs.readFileSync(UTILS_PATH, 'utf-8');
+    const handlers = fs.readFileSync(HANDLER_PATH, 'utf-8');
+    const manager = fs.readFileSync(MANAGER_PATH, 'utf-8');
 
-    expect(source).toContain('Number(error?.status) !== 409');
-    expect(source).toContain("payload.error_code !== 'GIT_UNFINISHED_MERGE'");
-    expect(source).toContain('function openUnfinishedMergeDialogFromError(error)');
-    expect(source).toContain('showUnfinishedMergeDialog = true;');
-    expect(source).toContain('const handledByDialog = openUnfinishedMergeDialogFromError(e);');
-    expect(source).toContain('await loadMergeRecoveryState();');
+    expect(utils).toContain("error_code !== 'GIT_UNFINISHED_MERGE'");
+    expect(handlers).toContain('showUnfinishedMergeDialog: true');
+    expect(handlers).toContain('this.openUnfinishedMergeDialogFromError(e)');
+    expect(handlers).toContain('await this.loadMergeRecoveryState();');
+    expect(manager).toContain('h.handlePull');
+    expect(manager).toContain('h.loadMergeRecoveryState');
   });
 
   it('renders unresolved-merge dialog details and web recovery actions', () => {
-    const source = fs.readFileSync(COMPONENT_PATH, 'utf-8');
+    const source = fs.readFileSync(DIALOG_PATH, 'utf-8');
 
-    expect(source).toContain('{#if showUnfinishedMergeDialog && unfinishedMergeContext}');
+    expect(source).toContain('{#if show && unfinishedMergeContext}');
     expect(source).toContain('unfinishedMergeContext.repositoryPath');
     expect(source).toContain('unfinishedMergeContext.currentBranch');
     expect(source).toContain('unfinishedMergeContext.commands.join');
-    expect(source).toContain('handleCopyUnfinishedMergeCommands');
-    expect(source).toContain('handleOpenConflictResolver');
-    expect(source).toContain('handleAbortUnfinishedMerge');
-    expect(source).toContain('handleContinueUnfinishedMerge');
+    expect(source).toContain('onCopyCommands');
+    expect(source).toContain('onOpenConflictResolver');
+    expect(source).toContain('onAbortMerge');
+    expect(source).toContain('onContinueMerge');
     expect(source).toContain('$t.git?.unfinished_merge?.copy_commands');
   });
 });