chore: add .torch/ to .gitignore (runtime prompt-history and backups)

.torch/ is created at runtime by torch-lock backup and proposal apply.
It holds prompt version archives and state snapshots — operational data
that should not be tracked in source control.

https://claude.ai/code/session_01Ndq2D72Kp77BYo4owD63uY

.gitignore

@@ -1,6 +1,7 @@
 node_modules
 dist/
 .scheduler-memory/
+.torch/
 
 # Logs
 *.log