Provider connectivity tests now pass the actual upstream URL and loopback no-proxy rules into proxy fetch option resolution, including IPv6 loopback. This closes the local test/connectivity gap in the #896 proxy compatibility work without closing GitHub issues before release.
Tested: bun test src/utils/proxy.test.ts src/server/__tests__/providers.test.ts src/server/__tests__/network-settings.test.ts src/services/api/client.test.ts
Tested: bun run check:server
Not-tested: Windows dev-sidecar real-machine retest and release build confirmation for #896.
Confidence: medium
Scope-risk: narrow
Preserve loopback NO_PROXY entries when Electron or manual network settings inject proxy environment variables, and make the Anthropic client skip Bun proxy fetch options for local desktop provider proxy base URLs.
Tested: bun test src/utils/proxy.test.ts src/services/api/client.test.ts src/server/__tests__/network-settings.test.ts src/server/__tests__/conversation-service.test.ts
Tested: cd desktop && bun run test -- electron/services/sidecarManager.test.ts --run
Tested: bun run check:server
Tested: bun run check:native
Not-tested: Windows dev-sidecar real-machine retest for #896; current Mac can only prove loopback proxy bypass behavior and native packaging.
Confidence: medium
Scope-risk: moderate
