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/Console/Commands/Module/DeactivateCommand.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace MintyPHP\Console\Commands\Module;
+
+final class DeactivateCommand extends AbstractModuleCommand
+{
+    public function name(): string
+    {
+        return 'module:deactivate';
+    }
+
+    public function description(): string
+    {
+        return 'Run a module\'s deactivation handler';
+    }
+
+    public function usage(): string
+    {
+        return <<<'USAGE'
+        Usage: php bin/console module:deactivate <module-id> [options]
+
+        Options:
+          --confirm    Execute the deactivation handler
+          --dry-run    Validate the handler without executing
+
+        The module does not need to be in the enabled list.
+        USAGE;
+    }
+
+    public function execute(array $args, array $options): int
+    {
+        $moduleId = $args[0] ?? '';
+        if ($moduleId === '') {
+            fwrite(STDERR, $this->usage() . "\n");
+            return 1;
+        }
+
+        $result = $this->moduleRunner()->deactivate(
+            $moduleId,
+            (bool) ($options['confirm'] ?? false),
+            (bool) ($options['dry-run'] ?? false)
+        );
+
+        $stream = $result['exit_code'] === 0 ? STDOUT : STDERR;
+        fwrite($stream, $result['message'] . PHP_EOL);
+
+        return (int) $result['exit_code'];
+    }
+}