feat: orchestration harness, selective install, observer improvements

scripts/lib/install-targets/registry.js

@@ -0,0 +1,64 @@
+const antigravityProject = require('./antigravity-project');
+const claudeHome = require('./claude-home');
+const codexHome = require('./codex-home');
+const cursorProject = require('./cursor-project');
+const opencodeHome = require('./opencode-home');
+
+const ADAPTERS = Object.freeze([
+  claudeHome,
+  cursorProject,
+  antigravityProject,
+  codexHome,
+  opencodeHome,
+]);
+
+function listInstallTargetAdapters() {
+  return ADAPTERS.slice();
+}
+
+function getInstallTargetAdapter(targetOrAdapterId) {
+  const adapter = ADAPTERS.find(candidate => candidate.supports(targetOrAdapterId));
+
+  if (!adapter) {
+    throw new Error(`Unknown install target adapter: ${targetOrAdapterId}`);
+  }
+
+  return adapter;
+}
+
+function planInstallTargetScaffold(options = {}) {
+  const adapter = getInstallTargetAdapter(options.target);
+  const modules = Array.isArray(options.modules) ? options.modules : [];
+  const planningInput = {
+    repoRoot: options.repoRoot,
+    projectRoot: options.projectRoot || options.repoRoot,
+    homeDir: options.homeDir,
+  };
+  const targetRoot = adapter.resolveRoot(planningInput);
+  const installStatePath = adapter.getInstallStatePath(planningInput);
+  const operations = modules.flatMap(module => {
+    const paths = Array.isArray(module.paths) ? module.paths : [];
+    return paths.map(sourceRelativePath => adapter.createScaffoldOperation(
+      module.id,
+      sourceRelativePath,
+      planningInput
+    ));
+  });
+
+  return {
+    adapter: {
+      id: adapter.id,
+      target: adapter.target,
+      kind: adapter.kind,
+    },
+    targetRoot,
+    installStatePath,
+    operations,
+  };
+}
+
+module.exports = {
+  getInstallTargetAdapter,
+  listInstallTargetAdapters,
+  planInstallTargetScaffold,
+};