Affected: Homebrew: openclaw-cli

### Summary `system.run` env override sanitization allowed dangerous override-only helper-command pivots to reach subprocesses. A caller who could invoke `system.run` with `env` overrides could bypass allowlist/approval intent by steering an allowlisted tool through helper-command or config-loading environment variables such as `GIT_SSH_COMMAND`, editor/pager hooks, and `GIT_CONFIG_*` / `NPM_CONFIG_*`.

### Affected Packages / Versions - Package: `openclaw` (npm) - Latest published vulnerable version: `2026.3.2` - Affected range: `<= 2026.3.2` - Patched in: `2026.3.7`

### Details Before the fix, `src/infra/host-env-security.ts` blocked only a narrow set of override-only environment variables. Dangerous request-scoped overrides such as `GIT_SSH_COMMAND` and prefix families such as `GIT_CONFIG_*` and `NPM_CONFIG_*` could still survive `sanitizeSystemRunEnvOverrides(...)` / `sanitizeHostExecEnv(...)` and reach the spawned process.

That mattered for `system.run` allowlist and approval flows because approval evaluation was tied to the reviewed binary/argv, while the launched process could still inherit attacker-controlled env overrides that changed helper-command execution or config resolution. For allowlisted tools such as `git`, this allowed behavior outside the reviewed command semantics.

The fix extends the shared TypeScript and macOS policy to block dangerous override-only exact keys and prefixes while preserving trusted inherited base-environment behavior.

### Impact Th…