Fix pre_tool_use.py hook to not falsely blocks safe rm

[cmer]

Fixes #28

Quick sanity check tests

1) Test an allowed rm (should exit 0)

printf '%s' '{"tool_name":"Bash","tool_input":{"command":"rm /Users/me/project/soft-hold-enrollment/db/migrate/a.rb /Users/me/project/soft-hold-enrollment/db/migrate/b.rb"}}' \
  | uv run ~/.claude/hooks/pre_tool_use.py ; echo "exit=$?"

2) Test a blocked dangerous rm (should exit 2 + print BLOCKED)

printf '%s' '{"tool_name":"Bash","tool_input":{"command":"rm -rf /"}}' \
  | uv run ~/.claude/hooks/pre_tool_use.py ; echo "exit=$?"

3) Test .env access blocking (should exit 2)

printf '%s' '{"tool_name":"Bash","tool_input":{"command":"cat .env"}}' \
  | uv run ~/.claude/hooks/pre_tool_use.py ; echo "exit=$?"

[Hello2214]

( parenthesis) do matter