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/Repository/User/UserWriteRepositoryInterface.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace MintyPHP\Repository\User;
+
+/** Contract for user creation, updates, activation, tenant assignment, and preference changes. */
+interface UserWriteRepositoryInterface
+{
+    public function updateLastLogin(int $userId, string $provider = 'local'): void;
+
+    public function bumpAuthzVersion(int $userId): bool;
+
+    public function bumpAuthzVersionByUserIds(array $userIds): int;
+
+    public function create(array $data): int|false;
+
+    public function update(int $id, array $data): bool;
+
+    public function setActive(int $id, bool $active, ?int $changedBy = null): bool;
+
+    public function setCurrentTenant(int $id, int $tenantId): bool;
+
+    public function setActiveByUuids(array $uuids, bool $active, ?int $modifiedBy = null): bool;
+
+    public function setInactiveByIds(array $userIds, ?int $changedBy = null): int;
+
+    public function deleteByIds(array $userIds): int;
+
+    public function setLocale(int $id, string $locale): bool;
+
+    public function setTheme(int $id, string $theme): bool;
+
+    public function updateProfileFieldsFromSso(int $id, array $fields): bool;
+
+    public function setPassword(int $id, string $password): bool;
+
+    public function setEmailVerified(int $id): bool;
+
+    public function delete(int $id): bool;
+
+    public function deleteByUuids(array $uuids): bool;
+}