[Bug]: vp run lint:mobile skips ktlint/detekt and still exits 0 when Homebrew is unavailable

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

Build, CI, or release tooling

Steps to reproduce

1. On a machine without Homebrew (any Windows checkout), clone the repo and run vp i.
2. Confirm the tools are absent: ktlint --version and detekt --version both fail.
3. Run vp run lint:mobile.
4. Run echo $?.

Expected behavior

The command either runs the Kotlin checks, or fails clearly because it could not. A contributor should not be able to read a successful exit as "my Kotlin passed lint" when nothing was analyzed.

Actual behavior

The command prints three warnings and exits 0:

$ vp run lint:mobile
Found 8 Swift and 13 Kotlin native source files.
WARN: swiftlint is not installed; skipping SwiftLint. Install it with 'brew install swiftlint' or run 'brew bundle install --file apps/mobile/Brewfile'.
WARN: ktlint is not installed; skipping ktlint. Install it with 'brew install ktlint' or run 'brew bundle install --file apps/mobile/Brewfile'.
WARN: detekt is not installed; skipping detekt. Install it with 'brew install detekt' or run 'brew bundle install --file apps/mobile/Brewfile'.
Skipping generated native project folders: android/, ios/.
$ echo $?
0

Not one Kotlin file is analyzed. In scripts/mobile-native-static-check.ts, a missing tool routes to warnMissingTool and the run completes successfully; the only documented way to obtain the tools is apps/mobile/Brewfile and the brew install ... hints the warnings themselves print.

The macOS coupling is incidental rather than inherent: ktlint and detekt are plain JVM programs with no platform-specific components. Confirmed by running them on Windows 11 with Temurin JDK 17, using the published ktlint jar and detekt-cli zip — both honored apps/mobile/detekt.yml and apps/mobile/.editorconfig, and vp run lint:mobile then executed the full Kotlin check unmodified with the tools on PATH, reporting real violations. swiftlint genuinely requires macOS/Xcode and is skipped separately.

Scope: Homebrew is the blocker, not the OS. Windows has no Homebrew at all. Linux may work via Homebrew on Linux, but nothing in the repo documents that as a supported path, and I have not verified those formulae there.

CI is unaffected and still enforces the checks — .github/workflows/ci.yml runs this step on blacksmith-6vcpu-macos-26 after brew bundle install — so unchecked Kotlin does not reach main. The cost is local feedback: contributors without Homebrew get no signal until CI runs, and their local run looks green.

Relevant history: the Brewfile and scripts/mobile-native-static-check.ts arrived in #2013, and the CI step in #2899.

Impact

Minor bug or occasional failure

Version or commit

main @ fe281c5408164250da6688de6fc71ac12d8a9d8f

Environment

Windows 11 Pro 26200 (10.0.26200); Git Bash; Node/pnpm via Vite+; no Homebrew; Temurin JDK 17 installed manually.

Logs or stack traces

Full command output is in "Actual behavior". No stack trace is produced — the skip path is a warning, not an error.

Screenshots, recordings, or supporting files

N/A — the terminal output above is the complete evidence.

Workaround

Install a JDK, download the ktlint jar and detekt-cli zip from their GitHub releases, and put both on PATH. vp run lint:mobile then runs the Kotlin checks unmodified on Windows.

Start in scripts/mobile-native-static-check.ts at the warnMissingTool path used by vp run lint:mobile, then compare the tool requirements in apps/mobile/Brewfile with the CI step in .github/workflows/ci.yml. Reproduce with ktlint and detekt absent, and make the result clearly indicate whether Kotlin was checked; verify the command no longer reports an unchecked run as successful.