chore(release): version 3.0.0 (#38)

pyproject.toml allineato al layout V3.0.0 già in uso da README/CLAUDE.md.
uv lock (senza upgrade): cambia solo la riga della versione del progetto,
verificato col diff.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

uv.lock

@@ -1934,7 +1934,7 @@ wheels = [
 
 [[package]]
 name = "tiemeasureflow"
-version = "2.0.0"
+version = "3.0.0"
 source = { virtual = "." }
 dependencies = [
     { name = "pydantic" },