feat: Add RSR badges and canonical v3.0 specification

- Create SVG badges for all tiers (Rhodium/Gold/Silver/Bronze)
- Add badge usage documentation (badges/README.adoc)
- Create RSR_v3.0_CANONICAL.adoc for publishing to rhodium-standard-repositories
- Update README.adoc with Rhodium badge display
- Badges feature metallic gradients, accessibility features, and compliance percentages
- Canonical spec is LLM-optimized with [CRITICAL] markers and checklist format

Badges:
- rhodium.svg (200%) - Platinum/silver with purple accents
- gold.svg (110%) - Gold metallic gradient
- silver.svg (100%) - Silver/gray gradient
- bronze.svg (25%) - Bronze/copper gradient

RSR_v3.0_CANONICAL.adoc:
- Generic specification for all projects (not Fogbinder-specific)
- 21 requirements (R1-R11 Silver, R12-R21 Rhodium)
- Migration guide from TypeScript/Node.js
- Comprehensive FAQ
- Extension points (Appendices A-C)
- Governance and change process
- CC BY-SA 4.0 license

Author: claude

README.adoc

@@ -5,6 +5,8 @@
 :source-highlighter: rouge
 :experimental:
 
+link:https://github.com/hyperpolymath/rhodium-standard-repositories[image:badges/rhodium.svg[RSR Rhodium,align=center]]
+
 **Fogbinder** is a Zotero plugin designed for those who seek nuance in their research. It illuminates contradiction, emotional tone, and unresolved ambiguity within citations—making murk not something to fear, but something to follow.
 
 '''