EGRESS_ROLES, EGRESS_SINGLETON_ROLES, and PROVIDER_EGRESS_ROLES were
all empty frozensets after the codex_auth and claude_code_oauth roles
were removed. Delete the constants and all validation code that iterated
over them (the singleton-role loop and provider-role check in
_validate_egress_routes, the EGRESS_ROLES membership test in
EgressRoute.from_dict). EgressRoute.from_dict now rejects any role
string unconditionally; _validate_egress_routes loses its
agent_provider_template parameter entirely.
Assisted-by: Claude Code
didericis-claude
650f3aa93e