fix: cleanup transient completion variables

[reubeno]

No description provided.

[github-actions]

Test Results

  2 files    9 suites   1m 2s ⏱️
478 tests 478 ✅ 0 💤 0 ❌
947 runs  947 ✅ 0 💤 0 ❌

Results for commit 5976375.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (μs)	Test/PR (μs)	Delta (μs)	Delta %
expand_one_string	3.42 μs	3.42 μs	-0.00 μs	⚪ Unchanged
instantiate_shell	60.03 μs	59.67 μs	-0.36 μs	⚪ Unchanged
instantiate_shell_with_init_scripts	27856.50 μs	27913.82 μs	57.32 μs	⚪ Unchanged
parse_bash_completion	2711.72 μs	2704.40 μs	-7.32 μs	⚪ Unchanged
parse_sample_script	3.98 μs	4.04 μs	0.06 μs	🟠 +1.48%
run_echo_builtin_command	91.61 μs	89.13 μs	-2.49 μs	🟢 -2.71%
run_one_builtin_command	108.97 μs	108.31 μs	-0.66 μs	⚪ Unchanged
run_one_external_command	1945.63 μs	1898.76 μs	-46.87 μs	🟢 -2.41%
run_one_external_command_directly	1009.75 μs	1008.19 μs	-1.56 μs	⚪ Unchanged

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
brush-core/src/completion.rs	🔴 19.07%	🔴 18.63%	🔴 -0.44%
brush-core/src/env.rs	🟢 87.85%	🟢 88.05%	🟢 0.2%
brush-core/src/shell.rs	🟢 78.11%	🟢 78.54%	🟢 0.43%
brush-shell/src/main.rs	🟢 89.61%	🟢 90.26%	🟢 0.65%
Overall Coverage	🟢 72.71%	🟢 72.68%	🔴 -0.03%

Minimum allowed coverage is 70%, this run produced 72.68%