feat: complete Epic 0 — foundation migration & infrastructure setup

Stories 0.2-0.5: rename folders→declarations (backend+frontend), configure
Redis for cache/queue/sessions, add foundation database migrations
(permissions, archived_at), replace DeclarationStatus enum with architecture
lifecycle values, create DeclarationObserver for status transition validation
and auto-archive, fix controller status transitions to respect observer rules.

93 tests pass (240 assertions).

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

tests/Feature/RedisConnectivityTest.php

@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Support\Facades\Cache;
+
+test('redis cache driver can store and retrieve values', function () {
+    Cache::store('redis')->put('test-key', 'test-value', 60);
+
+    expect(Cache::store('redis')->get('test-key'))->toBe('test-value');
+
+    Cache::store('redis')->forget('test-key');
+});
+
+test('redis queue connection is configured in env', function () {
+    $env = collect(file(base_path('.env'), FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES))
+        ->filter(fn ($line) => ! str_starts_with(trim($line), '#'))
+        ->mapWithKeys(function ($line) {
+            [$key, $value] = explode('=', $line, 2);
+
+            return [trim($key) => trim($value)];
+        });
+
+    expect($env->get('QUEUE_CONNECTION'))->toBe('redis');
+});
+
+test('redis session driver is configured in env', function () {
+    $env = collect(file(base_path('.env'), FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES))
+        ->filter(fn ($line) => ! str_starts_with(trim($line), '#'))
+        ->mapWithKeys(function ($line) {
+            [$key, $value] = explode('=', $line, 2);
+
+            return [trim($key) => trim($value)];
+        });
+
+    expect($env->get('SESSION_DRIVER'))->toBe('redis');
+});