feat(schematic): eeschema WASM build + e2e harness

scripts/create-feature-patches.sh

@@ -9,15 +9,35 @@ FEATURE_DIR="features/${BRANCH}"
 
 mkdir -p "$FEATURE_DIR"
 
-# Root repo patch (exclude submodules)
-git diff HEAD -- ':!kicad' ':!wxwidgets' > "$FEATURE_DIR/root.patch"
+# Root repo patch (exclude submodules and features/ — the latter would cause
+# the patch to contain itself recursively).
+git diff HEAD -- ':!kicad' ':!wxwidgets' ':!features' > "$FEATURE_DIR/root.patch"
 
-# Submodule patches (diff from upstream base)
-KICAD_BASE=$(git -C kicad log --format='%H' --author-not='viktor.vaczi@emergence-engineering.com' --author-not='noreply@anthropic.com' -1)
-git -C kicad diff $KICAD_BASE > "$FEATURE_DIR/kicad.patch"
+# Submodule patches: diff against main's recorded submodule sha so the patch
+# captures only this feature branch's submodule work (committed + uncommitted),
+# never upstream changes that landed on main.
+sub_diff() {
+    local sub="$1"
+    local out="$2"
+    local main_sha
+    main_sha=$(git ls-tree origin/main "$sub" 2>/dev/null | awk '{print $3}')
+    if [ -z "$main_sha" ]; then
+        echo "Warning: could not resolve origin/main:$sub — skipping $out" >&2
+        rm -f "$out"
+        return
+    fi
+    local cur_sha
+    cur_sha=$(git -C "$sub" rev-parse HEAD)
+    if [ "$main_sha" = "$cur_sha" ] && git -C "$sub" diff --quiet; then
+        echo "No feature-specific $sub changes (submodule pointer matches main, worktree clean) — skipping $(basename "$out")"
+        rm -f "$out"
+        return
+    fi
+    git -C "$sub" diff "$main_sha" > "$out"
+}
 
-WX_BASE="v3.2.6"
-git -C wxwidgets diff $WX_BASE > "$FEATURE_DIR/wxwidgets.patch"
+sub_diff kicad     "$FEATURE_DIR/kicad.patch"
+sub_diff wxwidgets "$FEATURE_DIR/wxwidgets.patch"
 
 echo "Patches created in $FEATURE_DIR/"
 ls -la "$FEATURE_DIR"/*.patch 2>/dev/null || echo "No patches generated"