refactor: rename lib/ to core/ for clearer core-module separation

Rename the top-level lib/ directory to core/ so the project root
immediately communicates which code is core platform and which lives
in modules/. PHP namespaces (MintyPHP\*) are unchanged — only the
Composer PSR-4 path mapping moves from lib/ to core/.

Module-internal lib/ directories (modules/*/lib/) are untouched.

Updated across the full stack:
- composer.json PSR-4 mapping
- bootstrap entry points (web/index.php, bin/*, tests/bootstrap.php)
- tooling configs (phpstan.neon, phpunit.xml, php-cs-fixer)
- 26 architecture contract tests
- enforcement-policy, guard-catalog, quality-gates
- all documentation (CLAUDE.md, README, 25 docs/, .agents/skills/)
- bin/qa-extended.sh search paths
- .claude/settings.local.json permission paths

Workflow: .agents/runs/CORE-LIB-RENAME-001/ (Analyst → Planner →
Executor → Code Review (4 findings fixed) → Security Review →
Acceptance Test → Finalizer)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/Support/Tile.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace MintyPHP\Support;
+
+class Tile
+{
+    public static function render(array $options = []): void
+    {
+        $defaults = [
+            'href' => '#',
+            'label' => '',
+            'count' => null,
+            'icon' => 'bi bi-grid-1x2',
+            'iconBg' => null,
+            'iconColor' => null,
+            'class' => '',
+            'tooltip' => '',
+            'tooltipPos' => 'top',
+        ];
+
+        $data = array_merge($defaults, $options);
+        $template = dirname(__DIR__, 2) . '/templates/partials/app-tile.phtml';
+        if (!is_file($template)) {
+            return;
+        }
+
+        extract($data, EXTR_SKIP);
+        require $template;
+    }
+}