add exec() and exec_bg() builtins to El runtime

- exec(cmd) -> String: runs shell command, captures stdout, 30s timeout
- exec_bg(cmd) -> String: forks command in background, returns PID string
- add both to codegen arity table (builtin_arity)
- rebuild elc with updated arity table (self-hosting, identity-verified)
- update release snapshot at releases/v1.0.0-20260501/
This commit is contained in:
Will Anderson
2026-05-03 02:57:53 -05:00
parent 9d0e1f64d4
commit f97354e96b
8 changed files with 6013 additions and 222 deletions
+2080 -154
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