0.5.0 bake-off results, knowledge lookup tools, training progress chart

Bake-off (0.5.0 vs 0.4.0):
- Overall: 46.8% vs 45.2% (+1.6%), 0 errors vs 2
- Enchantments: +47% (20% → 67%)
- EssentialsX: +60% (0% → 60%)
- Effects: +25% (0% → 25%)
- Regressions: fill_build -67%, world -20%

Knowledge Lookup Tools (4 new):
- plugin.docs_lookup: WorldGuard, WorldEdit, CoreProtect, EssentialsX, LuckPerms docs
- minecraft.changelog_lookup: version history from Minecraft Wiki
- paper.docs_lookup: Paper server-specific documentation
- Wired into gateway model-driven tool loop and exploration self-play

Exploration Self-Play:
- General (vanilla MC) and plugins focus modes
- Wiki-grounded: model researches before acting, validates through RCON
- 2,243 exploration examples generated, 150 kept after quality filtering

Training Progress Chart:
- SVG chart showing training examples and inverse loss across versions
- Added to MODEL_CARD.md for Gitea display

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

agent/tools/tool_schemas.py

@@ -69,6 +69,95 @@ TOOL_SCHEMAS: List[Dict[str, Any]] = [
             }
         }
     },
+    {
+        "name": "plugin.docs_lookup",
+        "description": (
+            "Look up plugin command syntax and documentation for server plugins: "
+            "WorldGuard, WorldEdit/FAWE, CoreProtect, EssentialsX, LuckPerms. "
+            "Use this when unsure about plugin-specific command syntax, flags, "
+            "parameters, or configuration options."
+        ),
+        "parameters": {
+            "type": "object",
+            "properties": {
+                "plugin": {
+                    "type": "string",
+                    "enum": ["worldguard", "worldedit", "coreprotect", "essentialsx", "luckperms"],
+                    "description": "Which plugin to look up docs for."
+                },
+                "query": {
+                    "type": "string",
+                    "description": "What to search for (e.g. 'region flags', 'rollback syntax', 'group inheritance')."
+                }
+            },
+            "required": ["plugin", "query"],
+            "additionalProperties": False
+        },
+        "returns": {
+            "type": "object",
+            "properties": {
+                "content": {"type": "string"},
+                "url": {"type": "string"}
+            }
+        }
+    },
+    {
+        "name": "minecraft.changelog_lookup",
+        "description": (
+            "Look up what changed in a specific Minecraft version. Use this to check "
+            "if a feature, item, or command exists in the current version (1.21), "
+            "when something was added or removed, or what changed between versions."
+        ),
+        "parameters": {
+            "type": "object",
+            "properties": {
+                "version": {
+                    "type": "string",
+                    "description": "Version to look up (e.g. '1.21', '1.20.4', '1.19'). Omit for latest."
+                },
+                "query": {
+                    "type": "string",
+                    "description": "What to search for in the changelog (e.g. 'mace', 'copper', 'trial chambers')."
+                }
+            },
+            "required": ["query"],
+            "additionalProperties": False
+        },
+        "returns": {
+            "type": "object",
+            "properties": {
+                "content": {"type": "string"},
+                "version": {"type": "string"},
+                "url": {"type": "string"}
+            }
+        }
+    },
+    {
+        "name": "paper.docs_lookup",
+        "description": (
+            "Look up Paper server-specific documentation — API differences from Spigot, "
+            "Paper-specific configuration, async chunk loading, and server optimization. "
+            "Use when behavior differs from vanilla or Spigot."
+        ),
+        "parameters": {
+            "type": "object",
+            "properties": {
+                "query": {
+                    "type": "string",
+                    "description": "What to search for (e.g. 'async chunks', 'paper-world config', 'timings')."
+                }
+            },
+            "required": ["query"],
+            "additionalProperties": False
+        },
+        "returns": {
+            "type": "object",
+            "properties": {
+                "content": {"type": "string"},
+                "url": {"type": "string"}
+            }
+        }
+    },
     {
         "name": "world.player_info",
         "description": (