Add ProjectZomboidItemLog (item.txt)

Per-line item gain/loss event log. Parser captures only the timestamp;
analysers decompose location/delta/item via ItemPattern::FIELDS.
Detectors: filename match plus content signature on the
container/floor/inventory location verbs paired with a signed delta.

src/Log/ProjectZomboid/ProjectZomboidItemLog.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Log\ProjectZomboid;
+
+use IndifferentKetchup\Codex\Analyser\AnalyserInterface;
+use IndifferentKetchup\Codex\Analyser\PatternAnalyser;
+use IndifferentKetchup\Codex\Detective\FilenameDetector;
+use IndifferentKetchup\Codex\Detective\WeightedSinglePatternDetector;
+use IndifferentKetchup\Codex\Parser\ParserInterface;
+use IndifferentKetchup\Codex\Parser\PatternParser;
+use IndifferentKetchup\Codex\Pattern\ProjectZomboid\ItemPattern;
+
+class ProjectZomboidItemLog extends ProjectZomboidEventLog
+{
+    public static function getDefaultParser(): ParserInterface
+    {
+        return static::makePatternParser(
+            ItemPattern::LINE,
+            [PatternParser::TIME]
+        );
+    }
+
+    public static function getDefaultAnalyser(): AnalyserInterface
+    {
+        return new PatternAnalyser();
+    }
+
+    public static function getDetectors(): array
+    {
+        return [
+            (new FilenameDetector())
+                ->setPattern('/_item\.txt$/')
+                ->setWeight(0.95),
+            (new WeightedSinglePatternDetector())
+                ->setPattern('/^\[[^\]]+\] \d{17} "[^"]+" (?:container|floor|inventory) [+\-]\d+ /m')
+                ->setWeight(0.90),
+        ];
+    }
+
+    public function getTitle(): string
+    {
+        return "Project Zomboid Item Log";
+    }
+}

src/Pattern/ProjectZomboid/ItemPattern.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Pattern\ProjectZomboid;
+
+/**
+ * Regex constants for the Project Zomboid item.txt format.
+ *
+ *   [time] steamid "player" location ±N x,y,z [Base.ItemId].
+ */
+class ItemPattern
+{
+    public const string LINE = '/^\[(\d{2}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3})\] \d{17} "[^"]+" \S+ [+\-]\d+ \d+,\d+,\d+ \[[^\]]+\]\.$/';
+
+    public const string FIELDS = '/^\[\d{2}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3}\] (?<steamid>\d{17}) "(?<player>[^"]+)" (?<location>\S+) (?<delta>[+\-]\d+) (?<x>\d+),(?<y>\d+),(?<z>\d+) \[(?<item>[^\]]+)\]\.$/';
+}