fix: neutral hint form for remaining client-facing tool mentions, Limits bounds accessor

Fix round 1 (task 10 review):
- FieldValidator's "unknown field" validation error (reaches the
  client via validation_failed's fields) and PostPresenter's
  DIVI_HINT (surfaced in the result's hints array) still named
  lit-content-types/lit-content-update as plain lit-<name>; converted
  both to the neutral "lit/<name> (direkt: lit-<name>)" form like the
  other hints from task 10. Re-grepped src/ for any other client-facing
  error/field/hints text naming a direct-by-default tool as lit-<name>
  (descriptions/schemas excluded per Q11c) - none left.
- Added Limits::bounds() (field => [min, max]) and made LimitsTab use
  it for the number inputs' min/max instead of a second, hardcoded
  copy of the same bounds.
- LimitsTab now shows a description note when the configured upload_mb
  exceeds wp_max_upload_size() (PHP's upload_max_filesize/post_max_size),
  since WordPress would refuse a larger upload before this limit ever
  applies.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

tests/Unit/Admin/LimitsTabTest.php

@@ -31,6 +31,7 @@ final class LimitsTabTest extends TestCase
         Functions\when('settings_fields')->justReturn(null);
         Functions\when('submit_button')->justReturn(null);
         Functions\when('get_option')->justReturn(['upload_mb' => 8]);
+        Functions\when('wp_max_upload_size')->justReturn(64 * 1024 * 1024);
 
         ob_start();
         (new LimitsTab())->render();
@@ -39,5 +40,40 @@ final class LimitsTabTest extends TestCase
         self::assertSame(3, substr_count($html, 'type="number"'));
         self::assertStringContainsString('name="lit_mcp_limits[upload_mb]" value="8"', $html);
         self::assertStringContainsString('name="lit_mcp_limits[log_retention_days]" value="90"', $html);
+        self::assertStringContainsString('min="1" max="100"', $html);
+        self::assertStringContainsString('min="1" max="3650"', $html);
+    }
+
+    public function testWarnsWhenUploadMbExceedsTheServersOwnUploadLimit(): void
+    {
+        Functions\stubEscapeFunctions();
+        Functions\stubTranslationFunctions();
+        Functions\when('settings_fields')->justReturn(null);
+        Functions\when('submit_button')->justReturn(null);
+        Functions\when('get_option')->justReturn(['upload_mb' => 50]);
+        Functions\when('wp_max_upload_size')->justReturn(2 * 1024 * 1024);
+
+        ob_start();
+        (new LimitsTab())->render();
+        $html = (string) ob_get_clean();
+
+        self::assertStringContainsString('class="description"', $html);
+        self::assertMatchesRegularExpression('/50 MB.*2 MB/s', $html);
+    }
+
+    public function testNoWarningWhenUploadMbIsWithinTheServersOwnUploadLimit(): void
+    {
+        Functions\stubEscapeFunctions();
+        Functions\stubTranslationFunctions();
+        Functions\when('settings_fields')->justReturn(null);
+        Functions\when('submit_button')->justReturn(null);
+        Functions\when('get_option')->justReturn(['upload_mb' => 5]);
+        Functions\when('wp_max_upload_size')->justReturn(64 * 1024 * 1024);
+
+        ob_start();
+        (new LimitsTab())->render();
+        $html = (string) ob_get_clean();
+
+        self::assertStringNotContainsString('class="description"', $html);
     }
 }