feat: implement dual-transport WAL architecture with permanent background leader and lightweight stubs

instructions.md

@@ -3,7 +3,7 @@
 This server provides an OS-agnostic, persistent Knowledge Graph and working memory. The following guidelines dictate **when** and **how** to best utilize these tools.
 
 ## 1. Ephemeral Working Memory (Sticky Notes)
-- **Tools:** dd_sticky_note, ␍ead_sticky_notes
+- **Tools:** add_sticky_note, ␍ead_sticky_notes
 - **When to use:** 
   - When you need to remember a specific context, broken build state, or pending task across conversation boundaries (e.g., "We are in the middle of refactoring main.rs, next step is testing").
   - When saving short-term scratchpad thoughts that don't belong in the permanent knowledge graph.