ENH: Add vertex_enumeration

[oyamad]

Julia translation of quantecon/game_theory/vertex_enumeration.py (AI assisted, mainly for design discussion)

@shizejin @samwycherley Thanks for the PRs (#64, #155). I propose to merge this one and close the earlier PRs. This

• uses Dict for label matching (O(V1 + V2); see RFC: game_theory: Use numba.typed.Dict in _vertex_enumeration_gen QuantEcon.py#766) instead of linear search (0(V_1 * V_2)); and
• leverages a CDDLib.jl feature for obtaining vertex-halfspace incidence information.

Close #43, close #64, close #155

[Copilot]

Pull request overview

Adds a new 2-player Nash equilibrium solver based on vertex enumeration (ported from QuantEcon.py), integrating Polyhedra/CDDLib incidence information and exposing the new API through exports, docs, and tests.

Changes:

• Introduces vertex_enumeration / vertex_enumeration_task and supporting polytope/labeling machinery.
• Adds a dedicated test suite for vertex enumeration and wires it into runtests.jl.
• Updates documentation autodocs pages and adjusts dependencies/compat for required CDDLib functionality.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/vertex_enumeration.jl	Implements vertex enumeration algorithm, best-response polytope construction, and labeling-based matching.
src/GameTheory.jl	Loads and exports the new vertex enumeration API (and adds Markdown import).
test/test_vertex_enumeration.jl	Adds coverage for nondegenerate/degenerate games and BestResponsePolytope labeling behavior.
test/runtests.jl	Includes the new vertex enumeration tests in the test runner.
docs/src/lib/computing_nash_equilibria.md	Adds vertex_enumeration.jl to autodocs pages.
Project.toml	Adds Markdown and tightens CDDLib compat to 0.10.2.