Regenerate Boost guidelines and skills

Generated by boost:update for Boost 2.8, which replaces the pest-testing
skill with testing-best-practices and adds infer-conventions.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017XYnWFt9pJEwvAmNFN38XD

.claude/skills/testing-best-practices/rules/security.md

@@ -0,0 +1,27 @@
+# Security Tests
+
+Test each security boundary where user input affects authorization, rendered output, or query construction. A defect at such a boundary can be difficult to detect because the feature may continue to work.
+
+Write a test for each of these cases:
+
+- **Cross-tenant access.** Request a record of a different tenant, team, or organization. Read `rules/endpoint-tests.md` for why the response should possibly be `404` rather than `403`.
+- **Each unprivileged role.** Use a dataset over the roles that the endpoint must refuse.
+- **Escaping user-provided content.** Test escaping in HTML and mail. Include names and every free-text field a template renders. Assert that dangerous characters are escaped and the raw value is absent. Do not assert an exact entity for a quote, because Markdown and mail CSS inliners may decode it.
+- **Injection into dynamic query components.** Examples include sort columns, filter fields, and sort directions.
+- **An unexpected key** in a payload or configuration array. A merge that accepts every key can set an attribute the user must not control.
+
+```php
+it('escapes dangerous content in the notification', function () {
+    $organization = Organization::factory()->make([
+        'name' => "O'Reilly <script>alert('xss')</script>",
+    ]);
+
+    $content = (new QuotaApproaching($organization, 80))->toMail()->render();
+
+    expect($content)
+        ->toContain('&lt;script&gt;')
+        ->not->toContain("<script>alert('xss')</script>");
+});
+```
+
+Laravel provides defenses against mass assignment, unauthorized access, and unescaped output. Test that the application applies the appropriate defense to each attribute, route, and template.