chore: drop Python 3.14 from advertised classifiers

Python 3.14 hit a FactorGraphModel instance-iteration bug in
autofit_workspace's overview_1_the_basics.py — same script, same
library code, only Python version differs from 3.13 (which passes).
Repro and investigation prompt: PyAutoPrompt/autofit/factor_graph_3_14_instance_iteration.md

Drop 3.14 from the classifier list so PyPI doesn't advertise support.
requires-python = ">=3.9" stays unchanged so users on 3.14 can still
install — they just get the import-time banner warning that 3.14 isn't
first-class.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 2 people

pyproject.toml

@@ -22,8 +22,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
-  "Programming Language :: Python :: 3.13",
-  "Programming Language :: Python :: 3.14"
+  "Programming Language :: Python :: 3.13"
 ]
 keywords = ["cli"]
 dependencies = [