feat(bash): auto-populate shell variables (PWD, HOME, USER, etc.)#252
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feat(bash): auto-populate shell variables (PWD, HOME, USER, etc.)#252
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…CONDS Initialize shell variables at startup: HOME, USER, UID, EUID from configured username (default: sandbox), HOSTNAME from configured value, BASH_VERSINFO array. Add dynamic expansion for PWD (from cwd), BASH_VERSION, SECONDS, HOSTNAME, OLDPWD. cd builtin now sets OLDPWD on directory change and reads HOME from variables. Builder env() calls also set shell variables so they override defaults. 10 spec tests covering PWD, HOME, USER, HOSTNAME, BASH_VERSION, BASH_VERSINFO, UID, SECONDS, cd updates.
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Summary
Test plan
cargo test --all-featurespasses (all 1020+ unit tests)cargo clippycleancargo fmt --checkcleanbash_comparison_tests789/789 match real bash