Add back TODOs

But remove a comment in pylint/rules.py that was a bit noisy. We use this pattern in a couple places, and I don't think it was helpful to spell it out in such detail. We've made improvements to the code itself to be a bit more obvious what is going on.

# Rust tests and lints will be skipped. Delete if not intended.
[ci skip-rust]

# Building wheels and fs_util will be skipped. Delete if not intended.
[ci skip-build-wheels]

src/python/pants/backend/python/goals/pytest_runner.py

@@ -140,6 +140,8 @@ async def setup_pytest_for_target(
                 # by importlib_metadata and then by Pytest). See
                 # https://github.com/jaraco/zipp/pull/26.
                 "--not-zip-safe",
+                # TODO(John Sirois): Support shading python binaries:
+                #   https://github.com/pantsbuild/pants/issues/9206
                 "--pex-path",
                 requirements_pex_request.input.output_filename,
             ),

src/python/pants/backend/python/lint/pylint/rules.py

@@ -108,10 +108,6 @@ def generate_args(*, source_files: SourceFiles, pylint: Pylint) -> Tuple[str, ..
 
 @rule(level=LogLevel.DEBUG)
 async def pylint_lint_partition(partition: PylintPartition, pylint: Pylint) -> LintResult:
-    # We build one PEX with Pylint requirements (including any first-party plugins), and another
-    # with all direct 3rd-party dependencies. Splitting this into two PEXes gives us finer-grained
-    # caching. We then merge via `--pex-path`. We use `PexFromTargetsRequest.for_requirements()`
-    # to get cache hits with other goals like `test` and `repl`.
     requirements_pex_request = Get(
         Pex,
         PexFromTargetsRequest,
@@ -141,6 +137,8 @@ async def pylint_lint_partition(partition: PylintPartition, pylint: Pylint) -> L
             requirements=PexRequirements([*pylint.all_requirements, *plugin_requirements]),
             entry_point=pylint.entry_point,
             interpreter_constraints=partition.interpreter_constraints,
+            # TODO(John Sirois): Support shading python binaries:
+            #   https://github.com/pantsbuild/pants/issues/9206
             additional_args=("--pex-path", requirements_pex_request.input.output_filename),
         ),
     )

src/python/pants/backend/python/typecheck/mypy/rules.py

@@ -159,8 +159,6 @@ async def mypy_typecheck(
     #     Python 2 wheels and they are not compatible with Python 3, then Pex will error about
     #     missing wheels. So, in this case, we set `PEX_IGNORE_ERRORS`, which will avoid erroring,
     #     but may result in MyPy complaining that it cannot find certain distributions.
-    #
-    #  * The runner Pex should use the same constraints as the tool Pex.
     code_interpreter_constraints = PexInterpreterConstraints.create_from_compatibility_fields(
         (
             tgt[PythonInterpreterCompatibility]