docs(todo): track single-jar consolidation idea

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

Author: dfa1

TODO.md

@@ -69,6 +69,11 @@
 
 ## Build
 
+- [ ] **Merge `core`/`reader`/`writer` into a single library jar** — the three modules are tightly
+  coupled (every `Encoding` class has both encode + decode; format constants are shared). A single
+  `vortex-java` artifact simplifies client dependency management and removes artificial module
+  boundaries. Keep `integration`, `performance`, and `cli` as separate modules. Package structure
+  (`encoding`, `io`, `writer`) already enforces internal boundaries without Maven.
 - [ ] prefix all modules with "vortex-"
 - [ ] add BOM module
 - [ ] deploy to maven central