chore(release): bump mem0ai to 2.0.4 (py) and 3.0.5 (ts) for delete_linked

Patch release so the new delete_linked option is publishable to PyPI/npm.
Adds Python v2.0.4 and TypeScript v3.0.5 changelog entries.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mem0ai"
-version = "2.0.3"
+version = "2.0.4"
 description = "Long-term memory for AI Agents"
 authors = [
     { name = "Mem0", email = "support@mem0.ai" }