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/Http/RequestRuntime.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace MintyPHP\Http;
+
+class RequestRuntime implements RequestRuntimeInterface
+{
+    public function method(): string
+    {
+        $method = strtoupper(trim((string) ($this->context()['method'] ?? '')));
+        if ($method === '') {
+            return 'GET';
+        }
+
+        return substr($method, 0, 8);
+    }
+
+    public function path(): string
+    {
+        return trim((string) ($this->context()['path'] ?? ''));
+    }
+
+    public function ip(): string
+    {
+        return trim((string) ($this->context()['ip'] ?? ''));
+    }
+
+    public function userAgent(): string
+    {
+        return trim((string) ($this->context()['user_agent'] ?? ''));
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function queryParams(): array
+    {
+        /** @var array<string, mixed> $query */
+        $query = $_GET;
+        return $query;
+    }
+
+    public function isSecure(): bool
+    {
+        $https = strtolower(trim((string) ($_SERVER['HTTPS'] ?? '')));
+        if (in_array($https, ['on', '1', 'true'], true)) {
+            return true;
+        }
+
+        $forwarded = strtolower(trim((string) ($_SERVER['HTTP_X_FORWARDED_PROTO'] ?? '')));
+        if ($forwarded === '') {
+            return false;
+        }
+
+        $parts = explode(',', $forwarded);
+        return trim((string) ($parts[0] ?? '')) === 'https';
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    private function context(): array
+    {
+        RequestContext::ensureStarted();
+        return RequestContext::context();
+    }
+}