feat: make each plugin an npm workspace built by a termix-plugin CLI

packages/plugin-sdk/cli/lib/legacy-core-imports.mjs

@@ -0,0 +1,61 @@
+/**
+ * Legacy core imports: the debt D1 removes.
+ *
+ * Plugin code predates the SDK and still reaches core, and in one case a
+ * sibling plugin, by relative path. Those specifiers must stay out of the
+ * bundle and be rewritten to where the built server puts the target.
+ *
+ * The rewrite is output-relative, not source-relative. Every plugin bundles
+ * to plugins/<id>/dist/backend.js, which sits at the same depth the old
+ * per-file output did, so one prefix covers a source file at any nesting.
+ *
+ * Delete this file in D1, once every plugin reaches core through the SDK.
+ */
+
+// "../../../src/backend/" or "../../../../src/backend/", any depth.
+const CORE_BACKEND = /^(?:\.\.\/)+src\/backend\//;
+// Shared types. Mostly erased at compile, but automations imports a real
+// value (AUTOMATION_DEFINITION_VERSION), so this has to resolve at runtime.
+const CORE_TYPES = /^(?:\.\.\/)+src\/types\//;
+const CORE_UI = /^(?:\.\.\/)+src\/ui\//;
+// "../../../<other-plugin>/backend/" -- only plugins/ai/.../executor.ts today.
+// esbuild filters are Go RE2, which has no lookahead, so "src" is excluded in
+// the callback rather than the pattern.
+const CROSS_PLUGIN = /^(?:\.\.\/)+([a-z0-9-]+)\/(?:src\/)?backend\//;
+
+/** dist/plugins/<id>/dist/backend.js -> dist/backend/... */
+const COMPILED_CORE = "../../../backend/backend/";
+const COMPILED_TYPES = "../../../backend/types/";
+
+export function legacyCoreImports({ pluginId, platform }) {
+  return {
+    name: "legacy-core-imports",
+    setup(build) {
+      build.onResolve({ filter: CORE_BACKEND }, (args) => ({
+        path: args.path.replace(CORE_BACKEND, COMPILED_CORE),
+        external: true,
+      }));
+
+      build.onResolve({ filter: CORE_TYPES }, (args) => ({
+        path: args.path.replace(CORE_TYPES, COMPILED_TYPES),
+        external: true,
+      }));
+
+      // The shell's own modules. Only plugins/docker's frontend entry reaches
+      // core this way; every other frontend uses the "@/" alias, which is
+      // externalized by name. A7 removes both.
+      if (platform === "browser") {
+        build.onResolve({ filter: CORE_UI }, (args) => ({
+          path: args.path,
+          external: true,
+        }));
+      }
+
+      build.onResolve({ filter: CROSS_PLUGIN }, (args) => {
+        const [, other] = CROSS_PLUGIN.exec(args.path);
+        if (other === "src" || other === pluginId) return null;
+        return { path: `../../${other}/dist/backend.js`, external: true };
+      });
+    },
+  };
+}