chore(memory): L0 line-1 convention — all files start with L0 summary

Migrated all memory files to have L0 comment as first line,
consistent with upstream PAI convention.

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

memory/cog-meta/improvements.md

@@ -1,5 +1,5 @@
-# Cog — Improvements
 <!-- L0: Feature ideas, wishlists, and repair notes -->
+# Cog — Improvements
 
 <!-- Edit in place by section. -->
 

memory/cog-meta/patterns.md

@@ -1,4 +1,4 @@
-# Cog — Learned Patterns
 <!-- L0: Distilled interaction and workflow rules from experience -->
+# Cog — Learned Patterns
 
 <!-- Edit in place. Distill self-observations into actionable patterns. Timeless rules only. HARD LIMIT: 110 lines / 7.5KB. -->

memory/cog-meta/scenario-calibration.md

@@ -1,5 +1,5 @@
-# Scenario Calibration
 <!-- L0: Prediction accuracy tracker for decision scenarios -->
+# Scenario Calibration
 
 <!-- Updated by /reflect when scenarios resolve. -->
 

memory/cog-meta/self-observations.md

@@ -1,4 +1,4 @@
-# Cog — Self-Observations
 <!-- L0: What worked and didn't in interactions — append-only -->
+# Cog — Self-Observations
 
 <!-- Append-only. Format: - YYYY-MM-DD [tag]: observation -->