fix(build): merge-time fixes for #500

- pre-push hook: skip with a notice when npm is not on PATH (GUI git
  clients and IDEs often run hooks with a minimal PATH), instead of
  blocking every push on "npm: not found"; real-push test with a
  stripped PATH
- test/git-hooks.test.ts: pin GIT_CONFIG_NOSYSTEM=1 and
  GIT_CONFIG_GLOBAL=/dev/null around the resolveGitHooksDir tests, so
  an exported global or a system core.hooksPath no longer fails them
- watch tsconfig.json, .prettierignore and .editorconfig too:
  typecheck and format:check read them
- check:browser-excludes: fail loudly when the vitest list output and
  the walked test/**/*.test.ts tree share no path (format drift would
  otherwise pass vacuously)
- Reword the PRE_PUSH_MARKER comment: bumping its version would make every
  installed v1 hook read as foreign and never refresh again.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

test/check-browser-test-excludes.test.ts

@@ -11,7 +11,9 @@ import { join, resolve } from 'node:path';
 import {
   findBrowserTests,
   findLeaks,
+  findTestFiles,
   importsBrowserDriver,
+  listingMatchesTree,
   parseVitestFileList,
 } from '../scripts/check-browser-test-excludes.mjs';
 import { BROWSER_TEST_GLOBS } from '../config/test-suites';
@@ -68,6 +70,15 @@ describe('findBrowserTests (fixture tree)', () => {
       'test/new.browser.test.ts',
     ]);
   });
+
+  it('lists every test file, browser-driven or not, in the same form', () => {
+    expect(findTestFiles(root)).toEqual([
+      'test/legacy-name.test.ts',
+      'test/nested/deep.test.ts',
+      'test/new.browser.test.ts',
+      'test/unit.test.ts',
+    ]);
+  });
 });
 
 describe('parseVitestFileList + findLeaks', () => {
@@ -83,6 +94,19 @@ describe('parseVitestFileList + findLeaks', () => {
     ]);
     expect(findLeaks(['test/new.browser.test.ts'], ci)).toEqual([]);
   });
+
+  it('flags a non-empty listing whose paths never match the tree instead of passing vacuously', () => {
+    const tree = ['test/legacy-name.test.ts', 'test/unit.test.ts'];
+    // e.g. a vitest upgrade that starts printing absolute paths: nothing leaks, but only
+    // because nothing matches, so the checker must refuse rather than report success.
+    const drifted = parseVitestFileList('/repo/test/legacy-name.test.ts\n/repo/test/unit.test.ts\n');
+    expect(drifted.size).toBe(2);
+    expect(findLeaks(['test/legacy-name.test.ts'], drifted)).toEqual([]);
+    expect(listingMatchesTree(drifted, tree)).toBe(false);
+
+    const healthy = parseVitestFileList('test/legacy-name.test.ts\ntest/unit.test.ts\n');
+    expect(listingMatchesTree(healthy, tree)).toBe(true);
+  });
 });
 
 describe('against this repository', () => {