fix(sync): deploy to last30daysCROSS with patched frontmatter

- Add CROSS to sync targets with sed-patched name/version/description
- Switch cp to rsync to handle identical file edge case on APFS
- CROSS SKILL.md gets last30daysCROSS skill root injected into search path

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/sync.sh

@@ -8,6 +8,7 @@ echo "Source: $SRC"
 
 TARGETS=(
   "$HOME/.claude/skills/last30days"
+  "$HOME/.claude/skills/last30daysCROSS"
   "$HOME/.agents/skills/last30days"
   "$HOME/.codex/skills/last30days"
 )
@@ -17,24 +18,32 @@ for t in "${TARGETS[@]}"; do
   echo "--- Syncing to $t ---"
   mkdir -p "$t/scripts/lib"
 
-  # SKILL.md
-  cp "$SRC/SKILL.md" "$t/"
+  # SKILL.md — CROSS gets patched frontmatter + skill root, others get verbatim copy
+  if [[ "$t" == *"last30daysCROSS"* ]]; then
+    sed \
+      -e 's/^name: last30days$/name: last30daysCROSS/' \
+      -e 's/^version: "2\.1"/version: "2.2-cross"/' \
+      -e "s|^description: .*|description: \"TEST BUILD with outcome-aware Polymarket scoring + cross-source linking. Research a topic from the last 30 days. Sources: Reddit, X, YouTube, Hacker News, Polymarket, web.\"|" \
+      -e "s/^argument-hint: .*/argument-hint: 'last30daysCROSS AI video tools'/" \
+      -e 's|"\$HOME/.claude/skills/last30days"|"$HOME/.claude/skills/last30daysCROSS" \\\n  "$HOME/.claude/skills/last30days"|' \
+      "$SRC/SKILL.md" > "$t/SKILL.md"
+  else
+    cp "$SRC/SKILL.md" "$t/"
+  fi
 
-  # Main script
-  cp "$SRC/scripts/last30days.py" "$t/scripts/"
-
-  # All lib modules
-  cp "$SRC/scripts/lib/"*.py "$t/scripts/lib/"
+  # Main script + lib modules (rsync handles identical files gracefully)
+  rsync -a "$SRC/scripts/last30days.py" "$t/scripts/"
+  rsync -a "$SRC/scripts/lib/"*.py "$t/scripts/lib/"
 
   # Vendor directory (bird-search CLI)
   if [ -d "$SRC/scripts/lib/vendor" ]; then
-    cp -r "$SRC/scripts/lib/vendor" "$t/scripts/lib/"
+    rsync -a "$SRC/scripts/lib/vendor" "$t/scripts/lib/"
   fi
 
   # Fixtures
   if [ -d "$SRC/fixtures" ]; then
     mkdir -p "$t/fixtures"
-    cp -r "$SRC/fixtures/"* "$t/fixtures/" 2>/dev/null || true
+    rsync -a "$SRC/fixtures/" "$t/fixtures/"
   fi
 
   # Count and report