Replace the luals lint config with emmylua

fmtk 2.1.4 onwards generates typedefs targeting emmylua that luals
misreads, and every fmtk changelog since 2.1.5 states luals support is
being dropped. luals 3.18.2 is already the latest release, so there is
nothing to bump.

The `--clusterio-modules` plugin has no emmylua equivalent, as emmylua
has no plugin interface, so it is reimplemented as `workspace.moduleMap`.
Those rules rewrite each file's own module path rather than the require
string, hence the reversed direction.

type.patch.lua is obsolete: `raise_event` now takes `LuaEventType` in
the generated typedefs, and `LuaObject` has become `LuaObject.base`.
exp_scenario/.luacheckrc was already dead, luacheck is never invoked.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.emmyrc.json

@@ -0,0 +1,42 @@
+{
+    "$schema": "https://raw.githubusercontent.com/EmmyLuaLs/emmylua-analyzer-rust/refs/heads/main/crates/emmylua_code_analysis/resources/schema.json",
+    "runtime": {
+        "version": "Lua5.2",
+        "requirePattern": [ "?", "?.lua" ]
+    },
+    "workspace": {
+        "$comment-moduleMap": "Replaces the fmtk --clusterio-modules plugin, rewrites each file's own module path rather than the require string",
+        "ignoreDir": [ ".github", "web", "dist", "factorio" ],
+        "ignoreGlobs": [ "**/node_modules/**", "**/dist/**" ],
+        "moduleMap": [
+            { "pattern": "^([^.]+)\\.module\\.module_exports$", "replace": "modules.$1" },
+            { "pattern": "^([^.]+)\\.module\\.(.+)$", "replace": "modules.$1.$2" }
+        ]
+    },
+    "doc": {
+        "privateName": [ "__*" ]
+    },
+    "$comment-disable": "Carried over from the luals config, which had these as editor only rather than checked in ci",
+    "$comment-unnecessary-if": "Disabled by the config fmtk generates for itself, the api union types make it unreliable",
+    "diagnostics": {
+        "globals": [ "__DebugAdapter", "__Profiler" ],
+        "disable": [
+            "assign-type-mismatch",
+            "await-in-sync",
+            "invert-if",
+            "missing-parameter",
+            "missing-return-value",
+            "param-type-mismatch",
+            "preferred-local-alias",
+            "redefined-local",
+            "redundant-parameter",
+            "redundant-return-value",
+            "return-type-mismatch",
+            "unbalanced-assignments",
+            "undefined-doc-param",
+            "unnecessary-assert",
+            "unnecessary-if",
+            "unused"
+        ]
+    }
+}