diff --git a/.claude/scheduled_tasks.lock b/.claude/scheduled_tasks.lock
deleted file mode 100644
index fcd29c01..00000000
--- a/.claude/scheduled_tasks.lock
+++ /dev/null
@@ -1 +0,0 @@
-{"sessionId":"f73c16cb-8fcd-4610-9196-44abc02a48a0","pid":10509,"procStart":"497429865","acquiredAt":1778482151930}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 762b2dd4..d810e1ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
 # Build outputs.
 /out/
 
+# Claude Code session artifacts.
+.claude/
+
 # Stray executables produced by ad-hoc `ww build` runs in the project
 # root. Real source for these lives under selfhost/test/ as .ww files.
 /loop