Tell copilot to not be annoying about intentional spelling issues

Author: blopker

.github/instructions/spelling-tests.instructions.md

@@ -0,0 +1,10 @@
+---
+applyTo:
+  - "**/tests/**"
+  - "**/examples/**"
+  - "**/word_lists/**"
+---
+
+This is a spell-checking tool. Files in test and example directories intentionally contain misspellings to verify the spell-checker works correctly. Word list files contain domain-specific vocabulary.
+
+Do NOT flag spelling errors, typos, or duplicate entries in these files - they are intentional test fixtures and vocabulary lists.

.gitignore

@@ -11,3 +11,5 @@ node_modules
 scratch/
 manifest.json
 dictionaries/**/source
+
+.claude