Move scripts/ to giant/tools/ (issues.md Issue 9)

`scripts` was published as a top-level distribution package, colliding
with one of the most generic names in the Python ecosystem and
shadowable by a stray scripts/ dir on the portal machines' shared
/work/lbogner. Move it under the giant namespace; the dwarf command
name is unchanged, only the Python import path and file location move.

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

tests/test_dwarf.py

@@ -3,15 +3,15 @@ from typer.testing import CliRunner
 from giant import cli as giant_cli
 from giant.config import Conditioning
 from giant.data import setup_cache
-from scripts import dwarf
-from scripts.dwarf import app
+from giant.tools import dwarf
+from giant.tools.dwarf import app
 from test_pipeline import _make_synthetic_steps
 
 runner = CliRunner()
 
 
 def test_conditioning_enum_shared_across_both_clis():
-    """giant.cli and scripts.dwarf must use the one giant.config.Conditioning
+    """giant.cli and giant.tools.dwarf must use the one giant.config.Conditioning
     enum, not independently redefined copies that could silently drift apart
     on valid --conditioning values."""
     assert dwarf.Conditioning is Conditioning