docs: add badges, fix naming consistency, improve ecosystem links

- Add license/Go Report Card badges to README header
- Standardize naming: CogOS (prose), cogos (binary/repo)
- Add cross-repo ecosystem references

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: chazmaniandinkle

README.md

@@ -1,5 +1,8 @@
 # Constellation Protocol — Proof of Concept
 
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
+[![Go Report Card](https://goreportcard.com/badge/github.com/cogos-dev/constellation)](https://goreportcard.com/report/github.com/cogos-dev/constellation)
+
 A distributed identity protocol where trust is earned through temporal consistency, not granted by authority.
 
 Each node maintains a hash-chained event ledger in a git repository, broadcasts signed state snapshots to peers, and derives trust from behavioral history rather than certificate authority. Stolen keys are insufficient for impersonation because trust is coupled to the full event chain, not just a credential.