chore: gitignore claude code local files (cadence-workflow#81)

<!-- Describe what has changed in this PR -->
**What changed?**
gitignore claude code local files

<!-- Tell your future self why have you made these changes -->
**Why?**
those files are irrelevant to the project and should not be included in
git.

<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
**How did you test it?**
only gitignore

<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->
**Potential risks**

<!-- Is it notable for release? e.g. schema updates, configuration or
data migration required? If so, please mention it, and also update
CHANGELOG.md -->
**Release notes**

<!-- Is there any documentation updates should be made for config,
https://cadenceworkflow.io/docs/operation-guide/setup/ ? If so, please
open an PR in https://github.com/cadence-workflow/cadence-docs -->
**Documentation Changes**

---------

Signed-off-by: Tim Li <ltim@uber.com>

Author: timl3136

.gitignore

@@ -110,3 +110,5 @@ Desktop.ini
 CLAUDE.md
 settings.local.json
 .python-version
+*.bak
+.mcp.json