chore(codespell): allow 'Parth' (contributor name Parth Sangani)

Same pattern as existing entries 'Wee', 'Sherif', 'aline' — codespell
flags proper names as misspellings. Parth Sangani authored the pm-skills
external plugin (#1770). Without this entry, codespell fails on every PR
to staged.

Co-authored-by: Ada Marie <ada@kitfoxs.dev>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

.codespellrc

@@ -56,7 +56,9 @@
 
 # mane - intentional (unicorn anatomy reference in agents/ada-marie.agent.md)
 
-ignore-words-list = numer,wit,aks,edn,ser,ois,gir,rouge,categor,aline,ative,afterall,deques,dateA,dateB,TE,FillIn,alle,vai,LOD,InOut,pixelX,aNULL,Wee,Sherif,queston,Vertexes,nin,FO,CAF,mane
+# Parth - proper name (Parth Sangani, contributor — pm-skills external plugin)
+
+ignore-words-list = numer,wit,aks,edn,ser,ois,gir,rouge,categor,aline,ative,afterall,deques,dateA,dateB,TE,FillIn,alle,vai,LOD,InOut,pixelX,aNULL,Wee,Sherif,queston,Vertexes,nin,FO,CAF,mane,Parth
 
 # Skip certain files and directories