Initial commit: AI conversation impact methodology and toolkit

CC0-licensed methodology for estimating the environmental and social
costs of AI conversations (20+ categories), plus a reusable toolkit
for automated impact tracking in Claude Code sessions.

tasks/02-add-license.md

@@ -0,0 +1,16 @@
+# Task 2: Add a license file
+
+**Plan**: publish-methodology
+**Status**: DONE (MIT license chosen — covers both docs and scripts)
+**Deliverable**: `LICENSE` file in project root
+
+## What to do
+
+1. Ask the user which license they prefer. Suggest CC-BY-4.0 for the
+   methodology (allows reuse with attribution) and MIT for the tooling
+   scripts (standard for small utilities).
+2. Create the appropriate `LICENSE` file(s).
+
+## Done when
+
+- A license file exists that covers both the documentation and the scripts.