rdmsm4x-changelog-20260921-2104-rtty-unbundled-and-qa-gate-deadlocks

Resolved three open RTTy engineering issues on canonical host rdmsm4x: guarded bare unbundled binary launch against UNUserNotificationCenter SIGABRT (ISSUE-20260921-18), eliminated sequential-pipe deadlock in qa_release stage 4 via widened -arch probe wrapper and 300s watchdog (ISSUE-20260921-16), and eliminated ColorSync translation wedges in render audit under Rosetta with 600s watchdog and diagnostic sampling in test gates 2 and 3 (ISSUE-20260910-07).

Scope

Host: rdmsm4x (canonical dev root /Users/richh/dev/apps/RTTy).
Session: agy@rdmsm4x/1701b9be-cdc0-4f1d-8d14-31525f7f5eb4, 2026-09-21 20:54 → 21:04 EDT.
Repositories: apps/RTTy, issues.

What changed

Ticket	Commits	Changes
`ISSUE-20260921-18`	`38feb84` (RTTy), `58ba46d` (issues)	Guarded `MenuBarStatusItemApplicationDelegate.init()` and `LatencyNotificationService` against unbundled CLI execution (`Bundle.main.bundleIdentifier != nil && bundleURL.pathExtension == "app"`). Added unit test `testSharedMacApplicationDelegateDefaultInitDoesNotAbortWhenUnbundled`.
`ISSUE-20260921-16`	`75e84c9` (RTTy), `58b0941` (issues)	Widened `xcode26_clang_probe_wrapper.zsh` to match `-arch (arm64\|x86_64)` probe variants alongside the 9-argument form, routed `qa_release.sh` stage 4 xcodebuild through `CC="$CLANG_PROBE_WRAPPER"`, added 300s `run_with_watchdog`, and expanded `xcode26_clang_probe_wrapper_test.sh` to verify arch variants under `DEVELOPER_DIR`.
`ISSUE-20260910-07`	`5eae513` (RTTy), `ee3a09f` (issues)	Optimized `PixelBuffer.init` in `ApplicationFlowsRenderAuditTests.swift` to check `bitmap.colorSpace == .sRGB` first before invoking AppKit's ColorSync conversion pipeline (Rosetta execution dropped from 180s+ wedge to 31.89s). Wrapped `qa_release.sh` test gates 2 and 3 in `run_with_watchdog 600` with diagnostic `/usr/bin/sample` collection before termination.

Verification evidence

ISSUE-20260921-18: Swift unit test MenuBarLabelRenderingTests passed 48/48 tests; privacy contract passed; bare binary execution tested without aborting.
ISSUE-20260921-16: xcode26_clang_probe_wrapper_test.sh passed with 9-arg, 11-arg arm64/x86_64 (arch-first and arch-mid) forms, non-probe passthrough, and near-miss rejections; privacy contract passed.
ISSUE-20260910-07: ApplicationFlowsRenderAuditTests passed 11/11 tests natively (Apple Silicon) and under Rosetta (arch -x86_64 xctest) in 31.89 seconds with 0 failures; app_store_privacy_contract_test.sh passed.
Git sync: All commits merged to main in apps/RTTy and issues, pushed to origin, fleet, and backup remotes.

Files touched

apps/RTTy:
- Sources/RTTy/Services/LatencyNotificationService.swift
- Sources/RTTy/Views/MenuBarStatusItemController.swift
- Tests/RTTyTests/MenuBarLabelRenderingTests.swift
- Tests/RTTyTests/ApplicationFlowsRenderAuditTests.swift
- script/xcode26_clang_probe_wrapper.zsh
- script/qa_release.sh
- Tests/ScriptTests/xcode26_clang_probe_wrapper_test.sh
issues:
- resolved/ISSUE-20260921-18-an-unbundled-rtty-executable-aborts-in-u.md
- resolved/ISSUE-20260921-16-qa_release-sh-stage-4-xcodebuild-can-dea.md
- resolved/ISSUE-20260910-07-rtty-release-gate-3-rosetta-can-wedge-in.md

Undo

All changes are clean git commits on main. To revert: git revert <commit-sha>.