Clean repo for open source release

Remove build artifacts, dev tool configs, unused dependencies,
and third-party source dumps. Add proper README, update .gitignore,
clean up Makefile.

src/main/java/com/tiedup/remake/bounty/Bounty.java

@@ -0,0 +1,210 @@
+package com.tiedup.remake.bounty;
+
+import java.util.UUID;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.item.ItemStack;
+
+/**
+ * Represents a single bounty placed on a player.
+ *
+ * Phase 17: Bounty System
+ *
+ * A bounty is created when a player (client) offers a reward for capturing
+ * another player (target). Anyone who delivers the target to the client
+ * receives the reward.
+ */
+public class Bounty {
+
+    private final String id;
+    private final UUID clientId;
+    private final UUID targetId;
+    private String clientName;
+    private String targetName;
+    private final ItemStack reward;
+    private final long creationTime; // System.currentTimeMillis()
+    private final int durationSeconds; // How long the bounty lasts
+
+    /**
+     * Create a new bounty.
+     */
+    public Bounty(
+        UUID clientId,
+        String clientName,
+        UUID targetId,
+        String targetName,
+        ItemStack reward,
+        int durationSeconds
+    ) {
+        this.id = UUID.randomUUID().toString();
+        this.clientId = clientId;
+        this.clientName = clientName;
+        this.targetId = targetId;
+        this.targetName = targetName;
+        this.reward = reward.copy();
+        this.creationTime = System.currentTimeMillis();
+        this.durationSeconds = durationSeconds;
+    }
+
+    /**
+     * Create a bounty from NBT data.
+     */
+    private Bounty(
+        String id,
+        UUID clientId,
+        String clientName,
+        UUID targetId,
+        String targetName,
+        ItemStack reward,
+        long creationTime,
+        int durationSeconds
+    ) {
+        this.id = id;
+        this.clientId = clientId;
+        this.clientName = clientName;
+        this.targetId = targetId;
+        this.targetName = targetName;
+        this.reward = reward;
+        this.creationTime = creationTime;
+        this.durationSeconds = durationSeconds;
+    }
+
+    // ==================== GETTERS ====================
+
+    public String getId() {
+        return id;
+    }
+
+    public UUID getClientId() {
+        return clientId;
+    }
+
+    public UUID getTargetId() {
+        return targetId;
+    }
+
+    public String getClientName() {
+        return clientName;
+    }
+
+    public String getTargetName() {
+        return targetName;
+    }
+
+    public ItemStack getReward() {
+        return reward.copy();
+    }
+
+    public int getDurationSeconds() {
+        return durationSeconds;
+    }
+
+    public long getCreationTime() {
+        return creationTime;
+    }
+
+    // ==================== TIME CALCULATIONS ====================
+
+    /**
+     * Get remaining time in seconds.
+     */
+    public int getSecondsRemaining() {
+        long elapsed = (System.currentTimeMillis() - creationTime) / 1000;
+        return Math.max(0, durationSeconds - (int) elapsed);
+    }
+
+    /**
+     * Get remaining time as [hours, minutes].
+     */
+    public int[] getRemainingTime() {
+        int seconds = getSecondsRemaining();
+        int hours = seconds / 3600;
+        int minutes = (seconds % 3600) / 60;
+        return new int[] { hours, minutes };
+    }
+
+    /**
+     * Check if bounty has expired.
+     */
+    public boolean isExpired() {
+        return getSecondsRemaining() <= 0;
+    }
+
+    // ==================== PLAYER CHECKS ====================
+
+    /**
+     * Check if player is the client (creator) of this bounty.
+     */
+    public boolean isClient(UUID playerId) {
+        return clientId.equals(playerId);
+    }
+
+    /**
+     * Check if player is the target of this bounty.
+     */
+    public boolean isTarget(UUID playerId) {
+        return targetId.equals(playerId);
+    }
+
+    /**
+     * Check if bounty matches (client receives target).
+     */
+    public boolean matches(UUID clientId, UUID targetId) {
+        return this.clientId.equals(clientId) && this.targetId.equals(targetId);
+    }
+
+    // ==================== REWARD DESCRIPTION ====================
+
+    /**
+     * Get a description of the reward (e.g., "Diamond x 5").
+     */
+    public String getRewardDescription() {
+        if (reward.isEmpty()) {
+            return "Nothing";
+        }
+        return reward.getHoverName().getString() + " x " + reward.getCount();
+    }
+
+    // ==================== NAME UPDATES ====================
+
+    /**
+     * Update client name (for when player was offline during creation).
+     */
+    public void setClientName(String name) {
+        this.clientName = name;
+    }
+
+    /**
+     * Update target name (for when player was offline during creation).
+     */
+    public void setTargetName(String name) {
+        this.targetName = name;
+    }
+
+    // ==================== NBT SERIALIZATION ====================
+
+    public CompoundTag save() {
+        CompoundTag tag = new CompoundTag();
+        tag.putString("id", id);
+        tag.putUUID("clientId", clientId);
+        tag.putUUID("targetId", targetId);
+        tag.putString("clientName", clientName);
+        tag.putString("targetName", targetName);
+        tag.put("reward", reward.save(new CompoundTag()));
+        tag.putLong("creationTime", creationTime);
+        tag.putInt("durationSeconds", durationSeconds);
+        return tag;
+    }
+
+    public static Bounty load(CompoundTag tag) {
+        return new Bounty(
+            tag.getString("id"),
+            tag.getUUID("clientId"),
+            tag.getString("clientName"),
+            tag.getUUID("targetId"),
+            tag.getString("targetName"),
+            ItemStack.of(tag.getCompound("reward")),
+            tag.getLong("creationTime"),
+            tag.getInt("durationSeconds")
+        );
+    }
+}