Simplify Modal egress domain-list construction

[xeophon]

Simplify Modal's domain-list construction. This is a readability cleanup of the existing network-policy code.

Replace the nested expression with three statements that collect framework domains, append configured domains, and remove duplicates and loopback entries. Validation, domain ordering, and network-policy behavior stay the same.

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Note

Low Risk
Readability-only refactor in egress allowlist assembly; network policy semantics are unchanged.

Overview
Refactors how prepare_execution builds the Modal outbound_domain_allowlist when routes is set: instead of one nested comprehension, it now collects framework route domains, extends with config.allow domains, then deduplicates while dropping None (loopback framework URLs).

No intended behavior change — validation still happens in _egress_domain, ordering is framework routes then allow rules, and the same RPC call still sends domain and CIDR lists for restricted sandboxes.

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Note

Simplify Modal egress domain-list construction

Refactors the outbound domain allowlist in modal.py from a nested comprehension into explicit route collection, allow-rule extension, filtering, and order-preserving deduplication. The resulting domain ordering and omission of null domains stay equivalent to the prior implementation.

^{Macroscope summarized e7633d2.}

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[macroscopeapp]

Approvability

Verdict: Approved at e7633d2

Macroscope's review found this PR approvable — This is a small, self-contained readability refactor of Modal egress-list construction. Input evaluation order, filtering, deduplication, and network-policy behavior remain unchanged.

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