docs: update Claude Code releases (v2.1.15-v2.1.17)

- Add v2.1.17: Fix AVX crash
- Add v2.1.16: Task management system, VSCode plugins
- Add v2.1.15: npm deprecation, React Compiler perf
- Bump guide version to 3.11.4
- New milestone: v2.1.16 (task management)
- New breaking: npm installations deprecated

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

machine-readable/reference.yaml

@@ -3,7 +3,7 @@
 # Source: guide/ultimate-guide.md
 # Purpose: Condensed index for LLMs to quickly answer user questions about Claude Code
 
-version: "3.11.3"
+version: "3.11.4"
 updated: "2026-01-23"
 
 # ════════════════════════════════════════════════════════════════
@@ -537,7 +537,7 @@ ecosystem:
       - "Cross-links modified → Update all 4 repos"
     history:
       - date: "2026-01-20"
-        event: "Code Landing sync v3.11.3, 66 templates, cross-links"
+        event: "Code Landing sync v3.11.4, 66 templates, cross-links"
         commit: "5b5ce62"
       - date: "2026-01-20"
         event: "Cowork Landing fix (paths, README, UI badges)"