fix(cli): avoid login shells for lifecycle commands

[roodboi]

Summary

• run lifecycle commands with sh -c instead of login-shell mode
• keep the process-group cleanup wrapper intact while avoiding ~/.profile startup dependencies
• add regression coverage for the non-login lifecycle launcher contract

Verification

• bun test tests/project-lifecycle-processes.test.ts
• bun run typecheck
• bun x ultracite check src/commands/project.ts tests/project-lifecycle-processes.test.ts

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Latest commit: 2963d46

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