EpicenterHQ · braden-w · Mar 13, 2026 · Mar 13, 2026 · Mar 13, 2026 · Mar 13, 2026
diff --git a/apps/fs-explorer/README.md b/apps/fs-explorer/README.md
diff --git a/apps/fs-explorer/.gitignore → apps/opensidian/.gitignore b/apps/fs-explorer/.gitignore → apps/opensidian/.gitignore
diff --git a/apps/fs-explorer/.npmrc → apps/opensidian/.npmrc b/apps/fs-explorer/.npmrc → apps/opensidian/.npmrc
diff --git a/apps/opensidian/README.md b/apps/opensidian/README.md
@@ -0,0 +1,12 @@
+# OpenSidian
+
+Open-source, local-first note-taking app inspired by Obsidian. Built with SvelteKit on the Epicenter ecosystem.
+
+Part of the [Epicenter](https://github.com/EpicenterHQ/epicenter) monorepo.
+
+## Running
+
+```bash
+cd apps/opensidian
+bun dev
+```
diff --git a/apps/fs-explorer/package.json → apps/opensidian/package.json b/apps/fs-explorer/package.json → apps/opensidian/package.json
@@ -1,5 +1,5 @@
 {
-	"name": "fs-explorer",
+	"name": "opensidian",
 	"private": true,
 	"version": "0.0.1",
 	"type": "module",

diff --git a/apps/fs-explorer/src/app.css → apps/opensidian/src/app.css b/apps/fs-explorer/src/app.css → apps/opensidian/src/app.css
diff --git a/apps/fs-explorer/src/app.d.ts → apps/opensidian/src/app.d.ts b/apps/fs-explorer/src/app.d.ts → apps/opensidian/src/app.d.ts
diff --git a/apps/fs-explorer/src/app.html → apps/opensidian/src/app.html b/apps/fs-explorer/src/app.html → apps/opensidian/src/app.html
@@ -3,6 +3,7 @@
 	<head>
 		<meta charset="utf-8">
 		<meta name="viewport" content="width=device-width, initial-scale=1">
+		<title>OpenSidian</title>
 		%sveltekit.head%
 	</head>
 	<body data-sveltekit-preload-data="hover">

diff --git a/...plorer/src/lib/components/AppShell.svelte → ...sidian/src/lib/components/AppShell.svelte b/...plorer/src/lib/components/AppShell.svelte → ...sidian/src/lib/components/AppShell.svelte
diff --git a/...r/src/lib/components/ContentEditor.svelte → ...n/src/lib/components/ContentEditor.svelte b/...r/src/lib/components/ContentEditor.svelte → ...n/src/lib/components/ContentEditor.svelte
diff --git a/...er/src/lib/components/ContentPanel.svelte → ...an/src/lib/components/ContentPanel.svelte b/...er/src/lib/components/ContentPanel.svelte → ...an/src/lib/components/ContentPanel.svelte
diff --git a/...er/src/lib/components/CreateDialog.svelte → ...an/src/lib/components/CreateDialog.svelte b/...er/src/lib/components/CreateDialog.svelte → ...an/src/lib/components/CreateDialog.svelte
diff --git a/.../lib/components/DeleteConfirmation.svelte → .../lib/components/DeleteConfirmation.svelte b/.../lib/components/DeleteConfirmation.svelte → .../lib/components/DeleteConfirmation.svelte
diff --git a/...plorer/src/lib/components/FileTree.svelte → ...sidian/src/lib/components/FileTree.svelte b/...plorer/src/lib/components/FileTree.svelte → ...sidian/src/lib/components/FileTree.svelte
diff --git a/.../src/lib/components/PathBreadcrumb.svelte → .../src/lib/components/PathBreadcrumb.svelte b/.../src/lib/components/PathBreadcrumb.svelte → .../src/lib/components/PathBreadcrumb.svelte
diff --git a/...er/src/lib/components/RenameDialog.svelte → ...an/src/lib/components/RenameDialog.svelte b/...er/src/lib/components/RenameDialog.svelte → ...an/src/lib/components/RenameDialog.svelte
diff --git a/...xplorer/src/lib/components/Toolbar.svelte → ...nsidian/src/lib/components/Toolbar.svelte b/...xplorer/src/lib/components/Toolbar.svelte → ...nsidian/src/lib/components/Toolbar.svelte
diff --git a/...plorer/src/lib/components/TreeNode.svelte → ...sidian/src/lib/components/TreeNode.svelte b/...plorer/src/lib/components/TreeNode.svelte → ...sidian/src/lib/components/TreeNode.svelte
diff --git a/...fs-explorer/src/lib/fs/fs-state.svelte.ts → .../opensidian/src/lib/fs/fs-state.svelte.ts b/...fs-explorer/src/lib/fs/fs-state.svelte.ts → .../opensidian/src/lib/fs/fs-state.svelte.ts
@@ -30,7 +30,7 @@ import { toast } from 'svelte-sonner';
  */
 function createFsState() {
 	const ws = createWorkspace({
-		id: 'fs-explorer',
+		id: 'opensidian',
 		tables: { files: filesTable },
 	}).withExtension('persistence', indexeddbPersistence);
 	const fs = createYjsFileSystem(ws.tables.files, ws.documents.files.content);

diff --git a/apps/fs-explorer/src/routes/+layout.svelte → apps/opensidian/src/routes/+layout.svelte b/apps/fs-explorer/src/routes/+layout.svelte → apps/opensidian/src/routes/+layout.svelte
diff --git a/apps/fs-explorer/src/routes/+layout.ts → apps/opensidian/src/routes/+layout.ts b/apps/fs-explorer/src/routes/+layout.ts → apps/opensidian/src/routes/+layout.ts
diff --git a/apps/fs-explorer/src/routes/+page.svelte → apps/opensidian/src/routes/+page.svelte b/apps/fs-explorer/src/routes/+page.svelte → apps/opensidian/src/routes/+page.svelte
diff --git a/apps/fs-explorer/static/robots.txt → apps/opensidian/static/robots.txt b/apps/fs-explorer/static/robots.txt → apps/opensidian/static/robots.txt
diff --git a/apps/fs-explorer/svelte.config.js → apps/opensidian/svelte.config.js b/apps/fs-explorer/svelte.config.js → apps/opensidian/svelte.config.js
diff --git a/apps/fs-explorer/tsconfig.json → apps/opensidian/tsconfig.json b/apps/fs-explorer/tsconfig.json → apps/opensidian/tsconfig.json
diff --git a/apps/fs-explorer/vite.config.ts → apps/opensidian/vite.config.ts b/apps/fs-explorer/vite.config.ts → apps/opensidian/vite.config.ts
diff --git a/bun.lock b/bun.lock
diff --git a/packages/workspace/src/workspace/create-workspace.ts b/packages/workspace/src/workspace/create-workspace.ts
@@ -81,6 +81,27 @@ async function destroyLifo(
 	return errors;
 }
 
+/**
+ * Start all cleanups immediately in LIFO order without awaiting between them.
+ *
+ * Used in the sync builder error path where we can't await. Every cleanup is
+ * invoked before the throw propagates—async portions settle in the background.
+ * Rejections are observed (logged) so they don't become unhandled.
+ */
+function startDestroyLifo(
+	cleanups: (() => MaybePromise<void>)[],
+): void {
+	for (let i = cleanups.length - 1; i >= 0; i--) {
+		try {
+			Promise.resolve(cleanups[i]?.()).catch((err) => {
+				console.error('Extension cleanup error during rollback:', err);
+			});
+		} catch (err) {
+			console.error('Extension cleanup error during rollback:', err);
+		}
+	}
+}
+
 /**
  * Create a workspace client with chainable extension support.
  *
@@ -296,16 +317,7 @@ export function createWorkspace<
 					},
 				);
 			} catch (err) {
-				// Fire-and-forget: withExtension is sync so we can't await
-				destroyLifo(state.extensionCleanups).then((errors) => {
-					if (errors.length > 0) {
-						console.error(
-							'Extension cleanup errors during factory failure:',
-							errors,
-						);
-					}
-				});
-
+				startDestroyLifo(state.extensionCleanups);
 				throw err;
 			}
 		}

diff --git a/specs/20260313T101639-rename-fs-explorer-to-opensidian.md b/specs/20260313T101639-rename-fs-explorer-to-opensidian.md
@@ -0,0 +1,121 @@
+# Rename fs-explorer to OpenSidian
+
+**Goal**: Rebrand `apps/fs-explorer` (a dev-only filesystem UI) into **OpenSidian**—the starting point for an Obsidian-like note-taking app within the Epicenter monorepo.
+
+**Scope**: Medium rename—directory, configs, branding, README. No feature changes, no new dependencies, no Tauri yet.
+
+## Context
+
+`apps/fs-explorer/` is a SvelteKit web app with 10 components and one state file. It uses `@epicenter/filesystem`, `@epicenter/workspace`, and `@epicenter/ui`. Currently described as a "dev tool"—that changes with this rename.
+
+The app already has the bones of a file manager (tree view, content editor, create/rename/delete) built on Yjs CRDTs. Renaming it to OpenSidian sets the direction for gradual evolution toward an Obsidian clone.
+
+## Decisions
+
+- **Directory**: `apps/opensidian` (no hyphen—it's a proper noun, not two words)
+- **Package name**: `"opensidian"`
+- **Stays in monorepo**: Shared packages (`@epicenter/filesystem`, `@epicenter/workspace`, `@epicenter/ui`) are too valuable to fork away from right now
+- **Historical specs**: Left untouched. They're historical records referencing `fs-explorer` and that's fine.
+
+## Inventory of Changes
+
+### 1. Rename directory
+
+```
+apps/fs-explorer/ → apps/opensidian/
+```
+
+Git mv to preserve history.
+
+### 2. Update `apps/opensidian/package.json`
+
+```diff
+- "name": "fs-explorer",
++ "name": "opensidian",
+```
+
+### 3. Update `apps/opensidian/src/lib/fs/fs-state.svelte.ts`
+
+The workspace ID is used as the IndexedDB database name. Changing it means existing local data won't carry over—acceptable since this had no real users.
+
+```diff
+- id: 'fs-explorer',
++ id: 'opensidian',
+```
+
+### 4. Update `apps/opensidian/src/app.html`
+
+Add a title tag:
+
+```diff
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
++   <title>OpenSidian</title>
+    %sveltekit.head%
+  </head>
+```
+
+### 5. Rewrite `apps/opensidian/README.md`
+
+Replace the dev-tool README with one describing OpenSidian's purpose:
+
+```markdown
+# OpenSidian
+
+Open-source, local-first note-taking app inspired by Obsidian. Built with SvelteKit on the Epicenter ecosystem.
+
+Part of the [Epicenter](https://github.com/EpicenterHQ/epicenter) monorepo.
+
+## Running
+
+```bash
+cd apps/opensidian
+bun dev
+```
+```
+
+### 6. Run `bun install`
+
+Regenerates `bun.lock` with the new package name and directory references.
+
+### 7. Verify build
+
+```bash
+cd apps/opensidian && bun run build
+```
+
+## Out of Scope
+
+- Updating historical spec files that reference `fs-explorer` (they're accurate records of past work)
+- Adding Tauri (future work)
+- Any feature changes, new components, or UI modifications
+- Logo or favicon changes
+- Renaming the `EXECUTE_UNIFY_EXTENSION_LIFECYCLE.md` reference (historical)
+
+## Todo
+
+- [x] 1. `git mv apps/fs-explorer apps/opensidian`
+- [x] 2. Update `package.json` name to `"opensidian"`
+- [x] 3. Update workspace ID in `fs-state.svelte.ts` from `'fs-explorer'` to `'opensidian'`
+- [x] 4. Add `<title>OpenSidian</title>` to `app.html`
+- [x] 5. Rewrite `README.md` with new identity
+- [x] 6. Run `bun install` to regenerate lockfile
+- [x] 7. Verify build passes
+
+## Review
+
+**Status**: Implemented
+
+### Summary
+
+Renamed `apps/fs-explorer` to `apps/opensidian` with `git mv` to preserve history. Updated package name, workspace ID (IndexedDB database name), HTML title, and README. Build passes cleanly.
+
+### Deviations from Spec
+
+None. All changes matched the spec exactly.
+
+### Notes
+
+- Pre-existing a11y warnings (`autofocus` in CreateDialog/RenameDialog) and chunk size warning are unrelated to this rename.
+- Historical specs referencing `fs-explorer` left untouched per spec.