chore: update workspace state and memory

- Update workspace state timestamp
- Add weekly summary to MEMORY.md (removing duplicate entry)

skills/memory-manager/references/summary_template.md

@@ -0,0 +1,21 @@
+# Weekly Summary Template
+
+## Weekly Summary (YYYY-MM-DD to YYYY-MM-DD)
+
+**Key Learnings:**
+- [Important things learned this week]
+
+**Decisions Made:**
+- [Choices and their reasoning]
+
+**New Facts / Information:**
+- [Names, dates, facts to remember]
+
+**Action Items Completed:**
+- [Tasks finished]
+
+**Observations:**
+- [Patterns noticed, improvements identified]
+
+**User Preferences:**
+- [Things the user mentioned about likes/dislikes]