Initial commit: notification-elements-demo app

Interactive Angular 19 demo for @sda/notification-elements-ui with
6 sections: Bell & Feed, Notification Center, Inbox, Comments &
Threads, Mention Input, and Full-Featured layout. Includes mock
data, dark mode toggle, and real-time event log.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/piscina/CONTRIBUTING

@@ -0,0 +1,27 @@
+# Piscina is an OPEN Open Source Project
+
+## What?
+
+Individuals making significant and valuable contributions are given commit-access to the project to contribute as they see fit. This project is more like an open wiki than a standard guarded open source project.
+
+## Rules
+
+There are a few basic ground-rules for contributors:
+
+1. **No `--force` pushes** on `master` or modifying the Git history in any way after a PR has been merged.
+1. **Non-master branches** ought to be used for ongoing work.
+1. **External API changes and significant modifications** ought to be subject to an **internal pull-request** to solicit feedback from other contributors.
+1. Internal pull-requests to solicit feedback are *encouraged* for any other non-trivial contribution but left to the discretion of the contributor.
+1. Contributors should attempt to adhere to the prevailing code-style.
+1. 100% code coverage
+1. Semantic Versioning is used.
+
+## Releases
+
+Declaring formal releases remains the prerogative of the project maintainer.
+
+## Changes to this arrangement
+
+This document may also be subject to pull-requests or changes by contributors where you believe you have something valuable to add or change.
+
+-----------------------------------------