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/Scheduler/ScheduledJobRepositoryInterface.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace MintyPHP\Repository\Scheduler;
+
+/** Contract for scheduled job CRUD, due-job queries, and run status tracking. */
+interface ScheduledJobRepositoryInterface
+{
+    public function create(array $data): int|false;
+
+    public function find(int $id): ?array;
+
+    public function findByKey(string $jobKey): ?array;
+
+    public function listPaged(array $filters): array;
+
+    public function listDueJobs(string $nowUtc, int $limit = 20): array;
+
+    public function updateJobMeta(int $id, array $data): bool;
+
+    public function markRunning(int $id, string $startedAtUtc): bool;
+
+    public function finishRun(
+        int $id,
+        string $status,
+        string $startedAtUtc,
+        string $finishedAtUtc,
+        ?string $nextRunAtUtc,
+        ?string $errorCode,
+        ?string $errorMessage
+    ): bool;
+
+    /** Delete jobs whose job_key is not in the given list of valid keys. Returns affected row count. */
+    public function deleteOrphanedJobs(array $validKeys): int;
+}