Add Muxide: Pure Rust MP4 muxer for recording applications

[Michael-A-Kuykendall]

Adding Muxide, a zero-dependency pure-Rust MP4 muxer for recording applications, to the General Tools section.

Muxide provides:

• Takes correctly-timestamped, already-encoded audio/video frames
• Produces standards-compliant, immediately-playable MP4 files
• Pure Rust implementation with zero runtime dependencies
• No FFmpeg required - handles the last mile from encoder to playable MP4
• Supports H.264, H.265, AV1 video codecs and AAC, Opus audio codecs
• Fast-start ready MP4 output

Repository: https://github.com/Michael-A-Kuykendall/muxide
Category: General Tools (video processing utilities)
Tags: mp4, muxing, video-processing, rust, recording, encoder

This fits perfectly as a specialized MP4 muxing tool for video recording pipelines.

Summary by Sourcery

New Features:

• Include Muxide as a new general-purpose MP4 video processing tool entry in contents.json.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds the Muxide Rust MP4 muxing/demuxing library as a new General Tools entry in contents.json, categorizing it as a video processing utility with appropriate metadata for discovery.

File-Level Changes

Change	Details	Files
Register Muxide as a new General Tools video processing utility in the catalog metadata.	Add a new tool entry for Muxide in the General Tools section of the JSON catalog Populate repository URL, title/description, and feature highlights emphasizing MP4 muxing/demuxing and streaming use cases Assign appropriate tags (e.g., mp4, muxing, demuxing, video-processing, rust, streaming) and ensure the category is set to General Tools / video processing	contents.json

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Hey - I've reviewed your changes and they look great!

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