Run the local gate in CI: syntax, tests on 5.4 + LuaJIT, audit freshness

LuaJIT is the interpreter Balatro embeds, so it is the one that must
pass; the AUDIT.md diff check catches a synergies.lua change committed
without regenerating the map. Inert until the Gitea instance has an
Actions runner.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -0,0 +1,25 @@
+# Runs the same gate as local development: syntax check, the test suite, and
+# the audit. The suite runs under both Lua 5.4 (dev convenience) and LuaJIT --
+# LuaJIT is what Balatro actually embeds, so it is the one that must pass.
+# The audit step also fails if AUDIT.md was not regenerated after a
+# synergies.lua change (the committed map must match the data).
+name: test
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Lua
+        run: sudo apt-get update -q && sudo apt-get install -y -q lua5.4 luajit
+      - name: Syntax check
+        run: luac5.4 -p main.lua synergies.lua config.lua integrations.lua test.lua audit.lua
+      - name: Test suite (Lua 5.4)
+        run: lua5.4 test.lua
+      - name: Test suite (LuaJIT, the interpreter Balatro embeds)
+        run: luajit test.lua
+      - name: Audit is clean and AUDIT.md is current
+        run: |
+          lua5.4 audit.lua --write
+          git diff --exit-code AUDIT.md