dev app: a local build fetches helper deps a fresh worktree lacks

[m4ttheweric]

• stageLocalDevApp fetches deps into the scratch copy when rt-tray/deps/arm64 or rt-tray/deps/tools is missing, even after copying a partial source deps dir (a fresh worktree made "Rebuild from" fail with deps/arm64 missing)
• runs bash scripts/fetch-deps.sh arm64 in the scratch dir with a 30 min timeout; a failed fetch ends the log with ✗ ... naming the step
• build-dev-app.ts streams the fetch like the build

4 new tests in dev-app-stage.test.ts (no deps, partial deps, timeout, failed fetch); 12/12, tsc clean.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 2520166 and a5837df.

📒 Files selected for processing (3)

• lib/release/__tests__/dev-app-stage.test.ts
• lib/release/dev-app-stage.ts
• scripts/build-dev-app.ts

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