Add Gravatar and DNS Records collectors

Two pure-PHP collectors, no Python/venv/subprocess needed:
- GravatarRunner (email): checks gravatar.com/avatar/{md5}?d=404 for a
  200 vs 404. Scoped to that binary signal since Gravatar's profile
  JSON endpoint now requires API auth even for real, public profiles
  (confirmed against Gravatar's own creator's email).
- DnsRunner (domain): dns_get_record() for A/AAAA/MX/NS/TXT/CNAME. Raw
  payload is naturally keyed by record type, which the existing
  generic list-renderer on the investigation page turns into one
  collapsible section per type with no UI changes needed.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/Osint/RunnerRegistry.php

@@ -3,6 +3,8 @@
 namespace App\Osint;
 
 use App\Osint\Runners\CrtShRunner;
+use App\Osint\Runners\DnsRunner;
+use App\Osint\Runners\GravatarRunner;
 use App\Osint\Runners\HoleheRunner;
 use App\Osint\Runners\IpApiRunner;
 use App\Osint\Runners\SherlockRunner;
@@ -25,6 +27,8 @@ class RunnerRegistry
         'ip-api' => IpApiRunner::class,
         'theharvester' => TheHarvesterRunner::class,
         'holehe' => HoleheRunner::class,
+        'gravatar' => GravatarRunner::class,
+        'dns' => DnsRunner::class,
     ];
 
     public function has(string $sourceKey): bool

app/Osint/Runners/DnsRunner.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace App\Osint\Runners;
+
+use App\Models\Target;
+use App\Osint\Runner;
+use App\Osint\RunnerException;
+use App\Osint\RunnerResult;
+
+class DnsRunner implements Runner
+{
+    /**
+     * @var array<string, int>
+     */
+    private const RECORD_TYPES = [
+        'A' => DNS_A,
+        'AAAA' => DNS_AAAA,
+        'MX' => DNS_MX,
+        'NS' => DNS_NS,
+        'TXT' => DNS_TXT,
+        'CNAME' => DNS_CNAME,
+    ];
+
+    public function run(Target $target): RunnerResult
+    {
+        if ($target->type !== 'domain') {
+            throw new RunnerException('DNS lookup only supports "domain" targets.');
+        }
+
+        if (! preg_match('/^([a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$/', $target->value)) {
+            throw new RunnerException('Domain contains characters that are not safe to look up.');
+        }
+
+        $records = [];
+
+        foreach (self::RECORD_TYPES as $label => $type) {
+            // dns_get_record() emits a warning (not an exception) when a
+            // record type doesn't resolve for the domain — expected for
+            // most domains on most types, not a real error.
+            $found = @dns_get_record($target->value, $type);
+
+            if ($found === false || empty($found)) {
+                continue;
+            }
+
+            $records[$label] = array_values(array_unique(array_map(
+                fn (array $record) => $this->formatRecord($label, $record),
+                $found
+            )));
+        }
+
+        $total = array_sum(array_map('count', $records));
+
+        $summary = $total > 0
+            ? sprintf('Found %d DNS record%s across %d type%s (%s).',
+                $total, $total === 1 ? '' : 's',
+                count($records), count($records) === 1 ? '' : 's',
+                implode(', ', array_keys($records)))
+            : 'No DNS records found.';
+
+        return new RunnerResult(raw: $records, summary: $summary);
+    }
+
+    private function formatRecord(string $label, array $record): string
+    {
+        return match ($label) {
+            'A', 'AAAA' => $record['ip'] ?? '',
+            'MX' => sprintf('%d %s', $record['pri'] ?? 0, $record['target'] ?? ''),
+            'NS', 'CNAME' => $record['target'] ?? '',
+            'TXT' => $record['txt'] ?? '',
+            default => '',
+        };
+    }
+}

app/Osint/Runners/GravatarRunner.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Osint\Runners;
+
+use App\Models\Target;
+use App\Osint\Runner;
+use App\Osint\RunnerException;
+use App\Osint\RunnerResult;
+use Illuminate\Support\Facades\Http;
+
+class GravatarRunner implements Runner
+{
+    public function run(Target $target): RunnerResult
+    {
+        if ($target->type !== 'email') {
+            throw new RunnerException('Gravatar only supports "email" targets.');
+        }
+
+        if (! filter_var($target->value, FILTER_VALIDATE_EMAIL)) {
+            throw new RunnerException('Value is not a valid email address.');
+        }
+
+        // Gravatar's public profile JSON endpoint now requires API auth
+        // (returns 404 even for real profiles without a key), but the
+        // plain avatar-existence check is still open and reliable.
+        $hash = md5(strtolower(trim($target->value)));
+        $avatarUrl = "https://www.gravatar.com/avatar/{$hash}";
+
+        $response = Http::timeout((int) config('osint.run_timeout'))
+            ->get($avatarUrl, ['d' => '404']);
+
+        if ($response->status() !== 200 && $response->status() !== 404) {
+            throw new RunnerException('Gravatar request failed with status '.$response->status().'.');
+        }
+
+        $hasAvatar = $response->status() === 200;
+
+        return new RunnerResult(
+            raw: [
+                'has_avatar' => $hasAvatar,
+                'avatar_url' => $hasAvatar ? $avatarUrl : null,
+                'profile_url' => "https://gravatar.com/{$hash}",
+            ],
+            summary: $hasAvatar
+                ? 'Gravatar image found — this email is registered with Gravatar.'
+                : 'No Gravatar found for this email.',
+        );
+    }
+}

app/Providers/AppServiceProvider.php

@@ -30,5 +30,7 @@ class AppServiceProvider extends ServiceProvider
         RateLimiter::for('osint-runner:sherlock', fn () => Limit::perMinute(10));
         RateLimiter::for('osint-runner:theharvester', fn () => Limit::perMinute(5));
         RateLimiter::for('osint-runner:holehe', fn () => Limit::perMinute(15));
+        RateLimiter::for('osint-runner:gravatar', fn () => Limit::perMinute(45));
+        RateLimiter::for('osint-runner:dns', fn () => Limit::perMinute(60));
     }
 }