feat: Add SupplyChain - don't send what exists elsewhere

## Core Principle
Before sending ANY data:
1. Does destination already have this? (checksum)
2. Can it be fetched from closer source?
3. Can it be reconstructed from components?
4. Can it be generated from a manifest?

## Content-Addressable Storage
- Hash content → address (like Docker, Git, IPFS)
- Before send: "Do you have SHA256:abc123?"
- If yes: skip, just reference
- If no: check alternative sources first

## Multi-Source Assembly
Instead of sending 77GB:
1. Send manifest: {codec, container, metadata}
2. Reference common libs from package repos
3. Send only unique delta

## OSI Layer Optimization
- L7 App: Dedup, manifests, lazy fetch
- L6 Pres: Compression negotiation
- L5 Sess: Connection pooling
- L4 Trans: Multi-protocol, port diversity
- L3 Net: Multi-path, anycast, BGP
- L2 Data: Jumbo frames
- L1 Phys: Link aggregation

## Rate Limit Avoidance (Legitimate)
- Don't hit same API repeatedly
- Source from multiple registries:
  - Docker Hub, npm, PyPI, Maven
  - IPFS, Software Heritage
- Spread requests across time/IPs
- Use alternative endpoints

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: hyperpolymath