Node-to-FSA watcher bridge

[streamich]

No description provided.

[Copilot]

Pull request overview

Adds a Node.js fs.watch-backed FileSystemObserver implementation to the fs-node-to-fsa bridge, and verifies end-to-end watcher behavior when chaining fs-node-to-fsa → fs-fsa-to-node.

Changes:

• Introduces NodeFileSystemObserver (best-effort FileSystemObserver over fs.watch) and exports it from the package entrypoint.
• Adds unit tests for NodeFileSystemObserver plus an integration test that verifies fs.watch events propagate across both bridges.
• Updates READMEs to document watcher support and the FileSystemObserver-based implementation model.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/fs-node-to-fsa/src/NodeFileSystemObserver.ts	New FileSystemObserver implementation backed by fs.watch, producing change records.
packages/fs-node-to-fsa/src/index.ts	Exports the new observer from the public API.
packages/fs-node-to-fsa/src/tests/NodeFileSystemObserver.test.ts	Unit coverage for create/modify/delete/rename, recursion, errors, and lifecycle methods.
packages/fs-node-to-fsa/README.md	Documents NodeFileSystemObserver usage and behavior limitations.
packages/fs-fsa-to-node/src/tests/watch-chain.test.ts	Integration test to ensure fs.watch signals traverse both adapters.
packages/fs-fsa-to-node/README.md	Documents watcher support and how FileSystemObserver is selected/injected.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.