docs: simplify install instructions and consolidate dependencies

studies/202512_GenesysCX/ctm-token-calculator/pyproject.toml

@@ -7,16 +7,21 @@ name = "ctm-token-calculator"
 version = "0.1.0"
 description = "Genesys AI Token Cost & Business Case Calculator (CTM)"
 requires-python = ">=3.10"
+# The notebooks are the deliverables (served with Mercury, exported via
+# nbconvert, tables via tabulate) — the whole toolchain is a required
+# runtime dependency, not an extra. `pip install -e .` must be enough.
 dependencies = [
     "pandas>=2.0",
-    "numpy>=1.25",
     "plotly>=5.18",
     "openpyxl>=3.1",
+    "mercury>=3.2",
+    "jupyterlab>=4.0",
+    "ipywidgets>=8.0",
+    "nbconvert>=7",
+    "tabulate>=0.9",
 ]
 
 [project.optional-dependencies]
-app = ["mercury>=3.2"]
-notebook = ["jupyterlab>=4.0", "ipywidgets>=8.0", "nbconvert>=7", "tabulate>=0.9"]
 dev = ["pytest>=7.4", "mypy>=1.8"]
 
 [tool.setuptools.packages.find]