[stealth 08/11] Harden stealth logging and telemetry defaults

[reflog]

Summary

• adds stealth build hooks for Go/Radiance log level and telemetry defaults
• preserves normal trace logging default for non-stealth builds
• replaces empty/trace stealth defaults with warn and keeps telemetry off unless explicitly enabled
• applies effective values through core init, FFI setup, app-side logging, Android/mobile early logging, and mobile IPC startup

Closes getlantern/engineering#3577

Validation

• env GOCACHE=/tmp/lantern-8770-go-cache GOMODCACHE=/tmp/lantern-8770-go-mod go test ./lantern-core
• gofmt -w lantern-core/stealth.go lantern-core/stealth_test.go lantern-core/core.go lantern-core/logging.go lantern-core/ffi/ffi.go lantern-core/mobile/mobile.go
• git diff --cached --check

Notes

• This PR covers defaults and guard tests. It does not attempt broad log-message redaction across every Radiance/Lantern call site; that should be handled with targeted follow-up static checks once the leakage check PR lands.

[Copilot]

Pull request overview

This PR adds Go-side stealth build helpers to harden log-level and telemetry defaults across Lantern Core startup paths while preserving existing non-stealth defaults.

Changes:

• Adds stealth-aware default resolution for log level and telemetry consent.
• Applies effective log/telemetry values in core initialization, FFI setup, mobile early logging, and mobile IPC startup.
• Adds guard tests for stealth/non-stealth log and telemetry defaults.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
lantern-core/stealth.go	Adds stealth build detection and effective default helpers.
lantern-core/stealth_test.go	Adds tests for stealth log-level and telemetry default behavior.
lantern-core/core.go	Applies effective log level and telemetry consent during core initialization.
lantern-core/logging.go	Uses effective default log level for app-side logging.
lantern-core/ffi/ffi.go	Uses effective default log level during FFI setup.
lantern-core/mobile/mobile.go	Applies effective defaults for mobile logging and IPC backend startup.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated no new comments.