chore: remove legacy tools/codex-skills (moved to .agents/skills), split filter drawer tests, clean up stale docs

- tools/codex-skills/ removed — skills now live in .agents/skills/
- docs/reference-agents-*.md removed — replaced by .agents/workflow.md
- FilterDrawerContractTest split into Runtime + Template contract tests
- bin scripts and .gitignore updated for .agents/ paths

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/Architecture/FilterDrawerRuntimeContractTest.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace MintyPHP\Tests\Architecture;
+
+use PHPUnit\Framework\TestCase;
+
+class FilterDrawerRuntimeContractTest extends TestCase
+{
+    use ProjectFileAssertionSupport;
+
+    public function testUsersResetKeepsTenantParam(): void
+    {
+        $moduleContent = $this->readProjectFile('web/js/pages/admin-users-index.js');
+        $this->assertStringContainsString("preserveFilterParams: ['tenant']", $moduleContent);
+    }
+
+    public function testFilterDrawerAndExperienceImplementFocusTrapAndDirtyApplyUi(): void
+    {
+        $drawerJs = $this->readProjectFile('web/js/components/app-filter-drawer.js');
+        $this->assertStringContainsString("drawer.setAttribute('role', 'dialog')", $drawerJs);
+        $this->assertStringContainsString("drawer.setAttribute('aria-modal', 'true')", $drawerJs);
+        $this->assertStringContainsString("if (event.key !== 'Tab') {return;}", $drawerJs);
+        $this->assertStringContainsString('if (lastTrigger && typeof lastTrigger.focus === \'function\'', $drawerJs);
+
+        $experienceJs = $this->readProjectFile('web/js/pages/app-list-filter-experience.js');
+        $this->assertStringContainsString('countDraftChanges(', $experienceJs);
+        $this->assertStringContainsString('countActiveDraftFilters(', $experienceJs);
+        $this->assertStringContainsString('drawerController.setApplyEnabled(changedCount > 0);', $experienceJs);
+        $this->assertStringContainsString('drawerController.setApplyCount(activeCount);', $experienceJs);
+        $this->assertStringContainsString('announceLive(', $experienceJs);
+
+        $stateJs = $this->readProjectFile('web/js/pages/app-list-filter-state.js');
+        $this->assertStringContainsString('buildChipsFromMeta', $stateJs);
+        $this->assertStringContainsString('removeChipFromMetaState', $stateJs);
+        $this->assertStringContainsString('clearMetaState', $stateJs);
+    }
+}