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/03-parameterize-tooling.md

@@ -0,0 +1,36 @@
+# Task 3: Parameterize impact tooling
+
+**Plan**: reusable-impact-tooling
+**Status**: DONE
+**Deliverable**: Portable hook script, viewer, and install script
+
+## What to do
+
+1. Refactor `pre-compact-snapshot.sh`:
+   - Remove hardcoded project paths.
+   - Use `$CLAUDE_PROJECT_DIR` or `cwd` from hook input consistently.
+   - Remove the debug trace line (`/tmp/precompact-debug.log`).
+
+2. Refactor `show-impact.sh`:
+   - Accept log file path as argument or auto-detect from project dir.
+
+3. Create `install.sh` that:
+   - Copies scripts to the user's `.claude/hooks/` directory.
+   - Adds the PreCompact hook entry to `.claude/settings.json` (project
+     or user level, user's choice).
+   - Verifies `jq` is available (dependency).
+   - Is idempotent (safe to run twice).
+
+4. Organize into a self-contained directory structure:
+   ```
+   impact-toolkit/
+     install.sh
+     hooks/pre-compact-snapshot.sh
+     hooks/show-impact.sh
+     README.md
+   ```
+
+## Done when
+
+- A user can clone the repo, run `install.sh`, and have impact tracking
+  working in their Claude Code project.