Update READMEs to reflect social cost proxy capabilities

Fix stale compute cost estimate ($500-1000 → $50-100), update toolkit
descriptions to mention social cost proxies, aggregate dashboard, and
review delta tool.

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

README.md

@@ -7,7 +7,7 @@ tools for tracking that cost over time.
 ## Why
 
 A single long conversation with a frontier LLM consumes on the order of
-100-250 Wh of energy, emits 30-80g of CO2, and costs $500-1000 in
+100-250 Wh of energy, emits 30-80g of CO2, and costs $50-100 in
 compute. Most of this cost is invisible to the user. This project makes
 it visible.
 
@@ -20,8 +20,9 @@ it visible.
 
 - **[impact-toolkit/](impact-toolkit/)** — A ready-to-install toolkit
   for [Claude Code](https://claude.ai/claude-code) that automatically
-  tracks token usage, energy, CO2, and cost on each context compaction.
-  Includes a manual annotation tool for recording positive impact.
+  tracks environmental, financial, and social cost proxies on each
+  context compaction. Includes aggregate dashboards and a review delta
+  tool for measuring human oversight of AI-generated code.
 
 - **[CLAUDE.md](CLAUDE.md)** — Instructions for an AI assistant to
   pursue net-positive impact: estimate costs before acting, maximize

impact-toolkit/README.md

@@ -1,6 +1,6 @@
 # Claude Code Impact Toolkit
 
-Track the environmental and financial cost of your Claude Code
+Track the environmental, financial, and social cost of your Claude Code
 conversations.
 
 ## What it does