feat: auto-delete old conversations, and stop a tool call that repeats (#15)

vitest.config.mts

@@ -10,6 +10,17 @@ export default defineConfig({
   test: {
     globals: true,
     include: ["src/__tests__/**/*.test.ts"],
+    /**
+     * One file at a time.
+     *
+     * The retention and snip tests exercise the real file system, and the snip
+     * directory is a single fixed path taken from the stubbed `environment`
+     * (`/tmp/lam-agent-support/snips`). Two files running at once would each
+     * clear and repopulate the other's directory mid-test, so files are run
+     * sequentially rather than giving every file its own path to reason about.
+     * The whole suite is well under a second either way.
+     */
+    fileParallelism: false,
   },
   resolve: {
     alias: {