fix: Exclude docs/ and examples/ from detect-secrets

Documentation and example files contain intentional example
credentials for illustration purposes.

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: 2 people

.pre-commit-config.yaml

@@ -64,6 +64,8 @@ repos:
             empathy_llm_toolkit/security/secrets_detector\.py$|
             empathy_llm_toolkit/security/secure_memdocs_example\.py$|
             demo_security_complete\.py$|
+            docs/|
+            examples/|
             anthropic-cookbook/
           )