feat(builtins): implement suspend

[reubeno]

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Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

brush-core/src/builtins/suspend.rs:20

• The error message could be more informative. Consider changing it to: "Cannot suspend a login shell without the force option enabled".

writeln!(context.stderr(), "login shell cannot be suspended")?

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Test Results

    2 files      9 suites   1m 17s ⏱️
  574 tests   574 ✅ 0 💤 0 ❌
1 134 runs  1 134 ✅ 0 💤 0 ❌

Results for commit a8bb996.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (μs)	Test/PR (μs)	Delta (μs)	Delta %
clone_shell_object	19.43 μs	19.38 μs	-0.05 μs	⚪ Unchanged
eval_arithmetic	0.44 μs	0.42 μs	-0.02 μs	⚪ Unchanged
expand_one_string	2.34 μs	2.37 μs	0.02 μs	⚪ Unchanged
for_loop	63.96 μs	64.10 μs	0.14 μs	⚪ Unchanged
function_call	5.08 μs	5.00 μs	-0.07 μs	⚪ Unchanged
instantiate_shell	62.26 μs	62.33 μs	0.08 μs	⚪ Unchanged
instantiate_shell_with_init_scripts	28647.31 μs	27343.24 μs	-1304.07 μs	🟢 -4.55%
parse_bash_completion	2873.37 μs	2861.82 μs	-11.56 μs	⚪ Unchanged
parse_sample_script	4.41 μs	4.48 μs	0.07 μs	🟠 +1.66%
run_echo_builtin_command	22.40 μs	22.01 μs	-0.39 μs	⚪ Unchanged
run_one_external_command	1948.78 μs	2240.28 μs	291.49 μs	🟠 +14.96%

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
brush-core/src/builtins/factory.rs	🟢 82.28%	🟢 82.35%	🟢 0.07%
Overall Coverage	🟢 74.42%	🟢 74.34%	🔴 -0.08%

Minimum allowed coverage is 70%, this run produced 74.34%� -0.07%** |

Minimum allowed coverage is 70%, this run produced 76.69%