Add @catmint-fs/indexdb-adapter package

[Copilot]

Browser-native FsAdapter implementation backed by IndexedDB. No Node.js dependencies.

Package structure

• Mirrors sqlite-adapter layout: src/types.ts, src/indexdb-adapter.ts, src/index.ts
• tsconfig.json extends root with DOM lib for IndexedDB types
• fake-indexeddb as dev-only dependency for Node.js test environment

Implementation

• Full FsAdapter interface: read/write, mkdir/readdir, rm/rmdir, rename, symlinks, stat, chmod/chown, permissions
• Async throughout (IndexedDB is inherently async, unlike the sync sqlite wrapper)
• Case-sensitive and case-insensitive path modes
• Constructor auto-initializes the database schema and root directory

Tests

• 72 tests across two suites, mirroring sqlite-adapter test patterns
• Integration tests covering all FsAdapter methods and error codes
• Case sensitivity tests for both modes

import { createLayer } from "@catmint-fs/core";
import { IndexdbAdapter } from "@catmint-fs/indexdb-adapter";

const adapter = new IndexdbAdapter({ dbName: "my-filesystem" });
const layer = await createLayer({ root: "/", adapter });

await layer.writeFile("/hello.txt", "Hello, world!\n");

Original prompt

Create a new package @catmint-fs/indexdb-adapter that is browser native (no nodejs dependencies) that can be used with the core library. It should have test coverage, readme, and structured similarly to other packages in the repo - you can use the sqlite adapter package as example. Remember to make sure the tests pass and that the code is written in similar structure and style

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