fix(scripts): replace hardcoded developer paths in test-v1-vs-v2.sh

REPO_DIR now derives from the script's location (with env-var override)
and the Claude binary is looked up via PATH (with CLAUDE env-var override)
instead of hardcoded to /Users/mvanhorn/.local/bin/claude. Works on any
checkout. Closes #297.

Co-authored-by: Dave Morin <dave@morin.com>

skills/last30days/scripts/test-v1-vs-v2.sh

@@ -6,7 +6,8 @@ set -euo pipefail
 # using `claude --print` to capture real end-to-end output.
 
 SKILL_DIR="$HOME/.claude/skills/last30days"
-REPO_DIR="/Users/mvanhorn/last30days-skill"
+REPO_DIR="${REPO_DIR:-$(cd "$(dirname "$0")/.." && pwd)}"
+CLAUDE="${CLAUDE:-$(command -v claude || echo claude)}"
 
 # Safety: always restore V2 SKILL.md on exit/crash
 cleanup() {
@@ -101,7 +102,7 @@ run_version() {
 
     # Run claude --print with the skill invocation
     # No timeout — claude --print exits on its own; kill manually if stuck
-    if /Users/mvanhorn/.local/bin/claude --print \
+    if "$CLAUDE" --print \
       "/last30days $query" \
       > "$outfile" 2>"$errfile"; then
       local end_time