Module writer 

Memory write discipline.

Enforces the two-step write pattern:

1. Write the memory file with proper frontmatter
2. Update MEMORY.md index with a one-line pointer

Prevents entropy by never dumping content into the index.

Functions

delete_memory

Remove a memory file and its index entry.

rebuild_index

Rebuild MEMORY.md from the actual files in the memory directory. Scans all .md files (except MEMORY.md itself), reads their frontmatter, and regenerates the index.

write_memory

Write a memory file and update the index atomically.