Add ConnectionFailureAnalyser

First custom Analyser subclass in this game tree. PatternAnalyser
operates per-entry without cross-entry state, so pairing
'attempting to join' with 'allowed to join' per Steam ID requires a
bespoke pass over the log. The analyser counts attempts and allowed
events per Steam ID and emits a ConnectionFailureProblem for each
player whose attempt count exceeds their allowed count. Unmatched
'attempting to join used queue' rows are surfaced as failures in v1
because a long queue wait is indistinguishable from a real failure
without timing context.

test/tests/Games/ProjectZomboid/Analyser/UserLogAnalysisTest.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Test\Tests\Games\ProjectZomboid\Analyser;
+
+use IndifferentKetchup\Codex\Analysis\ProjectZomboid\ConnectionFailureProblem;
+use IndifferentKetchup\Codex\Log\File\PathLogFile;
+use IndifferentKetchup\Codex\Log\ProjectZomboid\ProjectZomboidUserLog;
+use PHPUnit\Framework\TestCase;
+
+class UserLogAnalysisTest extends TestCase
+{
+    private function fixturePath(): string
+    {
+        return __DIR__ . '/../../../../src/Games/ProjectZomboid/fixtures/user-minimal.txt';
+    }
+
+    public function testFlagsPlayerWithUnmatchedAttempts(): void
+    {
+        $log = (new ProjectZomboidUserLog())->setLogFile(new PathLogFile($this->fixturePath()));
+        $log->parse();
+        $analysis = $log->analyse();
+
+        $problems = $analysis->getFilteredInsights(ConnectionFailureProblem::class);
+        $this->assertCount(1, $problems);
+
+        $problem = $problems[0];
+        $this->assertSame('76561198000000001', $problem->getSteamId());
+        $this->assertSame('Player1', $problem->getPlayer());
+        $this->assertSame(1, $problem->getUnmatchedAttempts());
+    }
+
+    public function testDoesNotFlagPlayerWithMatchedAttempts(): void
+    {
+        $log = (new ProjectZomboidUserLog())->setLogFile(new PathLogFile($this->fixturePath()));
+        $log->parse();
+        $analysis = $log->analyse();
+
+        $problems = $analysis->getFilteredInsights(ConnectionFailureProblem::class);
+        foreach ($problems as $problem) {
+            $this->assertNotSame('76561198000000002', $problem->getSteamId());
+        }
+    }
+}