[bug] Failing test: nudge_counter returns 60 instead of 1

`crates/edda-bridge-claude/src/dispatch/tests.rs:1058` -- `post_tool_use_increments_nudge_counter` expects `read_counter(pid, sid, "nudge_count")` to be 1 but gets 60.

Likely a test isolation issue with file-system-based state store leaking between tests. The value 60 suggests the cooldown logic is preventing nudge from firing and counter is reading stale state.