rdmsm4x-changelog-20260905-2140-ramdisk-unmount-facade-settle-fix

Summary: Eradicated unmount facade and early-exit shortcuts in ramdisk CLI, resolved DiskArbitration settle races with dual block/char device validation and stepped backoffs, optimized teardown latency, and verified 100% clean test passes across Master E2E suite (3x consecutive 192/192) and 20/20 portfolio applications.

• Scope: rdmsm4x:~/dev/apps/macOS-ramDisk-app/
• Files Touched:
  • Sources/ramdisk/main.swift
  • Sources/RAMDiskCore/StoragePrimitive.swift
• Commands Run:
  • swift package clean && swift build
  • swift test
  • swift test --sanitize=thread
  • python3 /tmp/rapid_stress_15.py
  • swift test --filter Tier5AdversarialTests
  • Tests/E2ETests/run_e2e_tests.sh (3 consecutive runs)
  • milestone4_verify_matrix.zsh
  • milestone4_run_tests.zsh
• Verification Evidence:
  • AST Invariant strings in ProcessLockInspector.swift match verbatim (rc=0)
  • Clean build with zero warnings and zero errors in 14.62s
  • 4/4 Unit tests passed; 4/4 ThreadSanitizer tests passed with 0 data races
  • Standalone safe refusal: 1.087s (< 2.5s) returning exit code 1 with structured JSON
  • 15-cycle rapid stress test: 15/15 passed in 69.08s (< 90s, avg 4.4s/cycle, 0 leaks)
  • Tier 5 Adversarial challenge: 39/39 passed in 4.48s (< 30s)
  • Master E2E Suite: 3 consecutive runs of 192/192 assertions passed (59s, 58s, 58s)
  • Post-test residual hygiene: mount | grep -i ramdisk, hdiutil info | grep -i "ram://", ls -la /Volumes | grep -i ramdisk all exit with rc=1
  • Portfolio Verification: 20/20 apps report 0 dirty, 0 0 Fleet Parity, 0 0 Backup Parity, 0 matches
  • Portfolio Tests: 20/20 test suites pass under Swift 6
  • ReplicantDB Check 3: roodb-legacy-DO-NOT-PUSH pinned with skipfetchall = true
• Git Commits:
  • Commit: 026dceb fix(ramdisk): eradicate unmount facade, resolve DiskArbitration settle races, and optimize teardown latency
  • Remotes pushed: fleet (git.ecs0.net:git/apps/macOS-ramDisk-app.git) and backup (https://github.com/richhdoty/rdmsm4x-dev-apps-macos-ramdisk-app.git)
• Undo: git revert 026dceb