Add ProjectZomboidPvpLog (pvp.txt)

Two row variants share the file: Safe House toggles ([LOG] Safety:)
and Combat events ([INFO] Combat: ... weapon=... damage=...). Parser
captures time, level, and the subsystem token (Safety|Combat) as the
entry prefix. COMBAT and SAFETY regexes extract structured fields,
including support for negative Z coordinates from basement levels.
Synthetic fixture covers both variants and represents zombie/vehicle/
real-PvP weapon types so analysers can later filter on damage>0 and
weapon!=zombie.

src/Pattern/ProjectZomboid/PvpPattern.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Pattern\ProjectZomboid;
+
+/**
+ * Regex constants for the Project Zomboid pvp.txt format.
+ *
+ * Two row variants share the file: Safe House toggles
+ *   [time][LOG] Safety: "player" (x,y,z) restore true.
+ * and Combat events
+ *   [time][INFO] Combat: "attacker" (x,y,z) hit "victim" (x,y,z) weapon="W" damage=N.NN.
+ *
+ * Z coordinates can be negative (basement levels: -1, -2).
+ *
+ * LINE captures, in order:
+ *   1. time
+ *   2. level     (LOG | INFO | WARN | ERROR)
+ *   3. subsystem (Safety | Combat)
+ */
+class PvpPattern
+{
+    public const string LINE = '/^\[(\d{2}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3})\]\[(LOG|INFO|WARN|ERROR)\] (\w+): .+\.$/';
+
+    public const string COMBAT = '/^Combat: "(?<attacker>[^"]+)" \((?<ax>\d+),(?<ay>\d+),(?<az>-?\d+)\) hit "(?<victim>[^"]+)" \((?<vx>\d+),(?<vy>\d+),(?<vz>-?\d+)\) weapon="(?<weapon>[^"]+)" damage=(?<damage>-?\d+\.\d+)\.$/';
+
+    public const string SAFETY = '/^Safety: "(?<player>[^"]+)" \((?<x>\d+),(?<y>\d+),(?<z>-?\d+)\) (?<verb>\w+) (?<state>true|false)\.$/';
+}