fix: correct multi-agent review findings across guide docs

- architecture.md: fix Asana attribution (not Atlassian), Daniela Amodei
  title (President not CEO), update model refs (3.5→4+), update footer
- cheatsheet.md: update date to Feb 2026, TodoWrite→Tasks API in decision tree
- methodologies.md: update date to Feb 2026
- sync-version.sh: escape dots in sed patterns to prevent URL corruption

Findings from 3-agent parallel code review (Agent Teams experiment).

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

scripts/sync-version.sh

@@ -49,8 +49,10 @@ check_file() {
     else
       # Replace all old 3.x.x versions with current version
       for v in $old_versions; do
+        # Escape dots for sed regex (prevents matching digits in URLs/IDs)
+        local escaped_v=$(echo "$v" | sed 's/\./\\./g')
         # macOS compatible sed
-        sed -i '' "s/$v/$VERSION/g" "$file"
+        sed -i '' "s/$escaped_v/$VERSION/g" "$file"
       done
       echo "✅ $file: updated"
     fi