fix: remove task-continuation-enforcer references after dev merge

Dev removed task-continuation-enforcer entirely. Remove all remaining
references from plugin hooks, event handler, tool-execute-before, and
config schema to align with origin/dev.

src/hooks/interactive-bash-session/index.ts

@@ -1,3 +1,3 @@
-export { createInteractiveBashSessionHook } from "./interactive-bash-session-hook"
+export { createInteractiveBashSessionHook } from "./hook"
 export { createInteractiveBashSessionTracker } from "./interactive-bash-session-tracker"
 export { parseTmuxCommand } from "./tmux-command-parser"