Remove all taxcalc functionality and dependencies

- Remove taxcalc from pyproject.toml optional dependencies
- Delete microdf/taxcalc.py module
- Delete microdf/tests/test_taxcalc.py
- Remove taxcalc imports and exports from microdf/__init__.py
- Remove taxcalc from _optional.py VERSIONS dict

This removes all taxcalc-specific functionality from the microdf package.
Documentation notebooks that demonstrate taxcalc integration may need
updates in a follow-up commit.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: MaxGhenis

microdf/__init__.py

@@ -47,13 +47,6 @@
     squared_poverty_gap,
 )
 from .tax import mtr, tax_from_mtrs
-from .taxcalc import (
-    add_weighted_metrics,
-    calc_df,
-    n65,
-    recalculate,
-    static_baseline_calc,
-)
 from .ubi import ubi_or_bens
 from .utils import (
     cartesian_product,
@@ -129,12 +122,6 @@
     # tax.py
     "mtr",
     "tax_from_mtrs",
-    # taxcalc.py
-    "static_baseline_calc",
-    "add_weighted_metrics",
-    "n65",
-    "calc_df",
-    "recalculate",
     # ubi.py
     "ubi_or_bens",
     # utils.py

microdf/_optional.py

@@ -7,9 +7,7 @@
 # Adapted from:
 # https://github.com/pandas-dev/pandas/blob/master/pandas/compat/_optional.py
 
-VERSIONS = {
-    "taxcalc": "2.0.0",
-}
+VERSIONS = {}
 
 
 def _get_version(module: types.ModuleType) -> str:

microdf/taxcalc.py

@@ -34,9 +34,6 @@ dev = [
 docs = [
     "jupyter_book",
 ]
-taxcalc = [
-    "taxcalc",
-]
 
 [tool.setuptools.packages.find]
 where = ["."]