docs: add TODO comments for files that can't import Cslib.Init

Added commented-out import statements with explanations for two files
that should ideally import Cslib.Init but cannot due to technical issues:

- Cslib.Foundations.Data.FinFun: Notation conflict (→₀ used by both
  FinFun and Mathlib.Finsupp)
- Cslib.Foundations.Semantics.LTS.Basic: Causes type elaboration
  ambiguities in downstream Automata files

These comments document the issue and serve as reminders for future
investigation.

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

Co-Authored-By: Claude <[email protected]>

Author: jessealama

Cslib/Foundations/Data/FinFun.lean

@@ -4,6 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Fabrizio Montesi, Xueying Qin
 -/
 
+-- import Cslib.Init  -- TODO: Notation conflict with Mathlib.Finsupp (both use →₀)
 import Mathlib.Data.Finset.Basic
 
 /-! # Finite functions

Cslib/Foundations/Semantics/LTS/Basic.lean

@@ -4,6 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Fabrizio Montesi
 -/
 
+-- import Cslib.Init  -- TODO: Causes type elaboration ambiguities in downstream files (Automata)
 import Mathlib.Tactic.Lemma
 import Mathlib.Data.Finite.Defs
 import Mathlib.Data.Fintype.Basic