rdmbair15m5-changelog-20260916-0345-spike-20260915-02-resolved-and-rdreceipt-hardened

Summary

Resolved high-severity SPIKE-20260915-02 with definitive forensic attribution of the unattributed writer on rdmbair15m5; hardened Packages/rdRECEIPT test concurrency against Apple Neural Engine contention with 534/534 tests passing; advanced FEAT-20260831-02 and verified clean Xcode builds for ReceiptRoo.

Scope

Hosts: rdmbair15m5, rdmsm4x. Repositories: dev-root-rdmbair15m5, issues on rdmsm4x, RDReceipt (Packages/rdRECEIPT), ReceiptRoo.

Exact Files Touched

• /Users/richh/dev/AGENTS.md — recorded SPIKE-20260915-02 resolution and attribution.
• /Users/richh/dev/CLAUDE.md — recorded SPIKE-20260915-02 resolution and attribution.
• rdmsm4x:~/dev/issues/ — resolved SPIKE-20260915-02, updated FEAT-20260831-02.
• rdmsm4x:~/dev/apps/rdRECEIPT/.../Challenger2M4EmpiricalStressTests.swift — tuned executeSubprocess timeout to 30.0s to accommodate Apple Neural Engine queue contention during concurrent test execution.
• ~/.agent-coordination/mail/ — broadcasted spike resolution message 20260916-034043-0D00B71E and synced across fleet.

Details & Forensic Findings

1. SPIKE-20260915-02 Resolution

• Investigation: Audited ~/.gemini/antigravity-cli/brain/ transcripts for writes occurring between 21:45 and 21:53 EDT on 2026-09-15.
• Attribution: Identified writer as Antigravity session 8dffaf9d-ebca-41ce-858a-394f872bab77 (teamwork_preview_orchestrator_fleet_advancement) with subagents teamwork_preview_worker_m1_worktree and teamwork_preview_worker_m2_daemon (5ef59686-3dca-433e-a67f-ee60e550466f).
• Mechanism: The agent executed shell commands via cd <target> && ... and file tool writes via absolute paths from workspace root /Users/richh/dev.
• Root Cause of Detector Blindness: mcp__tyrell__conflicts inspected only top-level harness process cwd rather than child process subshell paths or file handle activity.
• Resolution: Ticket SPIKE-20260915-02 resolved on canonical rdmsm4x; root AGENTS.md and CLAUDE.md updated and pushed to git.ecs0.net and github.com.

2. FEAT-20260831-02 & Packages/rdRECEIPT Concurrency Hardening

• Symptom: In Challenger2M4EmpiricalStressTests.swift, benchmark and scan subprocess execution occasionally timed out after 10.0s under full parallel test runs.
• Root Cause: Spindump and sample analysis of child PID 66752 revealed that VisionOCRService calls into VNCRImageReaderDetector / TextRecognition and serializes on the Apple Neural Engine (com.apple.anef.p5). Under heavy parallel test contention across multiple test targets, cold model loading into ANE exceeded the 10.0s threshold.
• Remediation: Tuned executeSubprocess default timeout to 30.0s.
• Verification: swift test across all 6 targets in Packages/rdRECEIPT passed 534 / 534 tests in 89 suites with 0 failures under Swift 6 strict concurrency (.swiftLanguageMode(.v6)). Committed d534bb9 and pushed to origin and fleet.

3. Multiplatform Builds

• Verified ReceiptRoo-macOS (macOS 26.0+) built cleanly (** BUILD SUCCEEDED **).
• Verified ReceiptRoo-iOS (iOS Simulator 26.0+) built cleanly (** BUILD SUCCEEDED **).

Verification Commands

# Root docs commit & sync
git -C /Users/richh/dev status

# Packages/rdRECEIPT full test battery
cd /Users/richh/dev/apps/rdRECEIPT/.claude/worktrees/rdreceipt-chat-thread-setup-a94cd2/Packages/rdRECEIPT
swift test

# Xcode app builds
cd /Users/richh/dev/apps/ReceiptRoo
xcodebuild -project ReceiptRoo.xcodeproj -scheme ReceiptRoo-macOS -configuration Debug build
xcodebuild -project ReceiptRoo.xcodeproj -scheme ReceiptRoo-iOS -destination 'generic/platform=iOS Simulator' -configuration Debug build

How to Undo

• Git reverts: git -C /Users/richh/dev revert 0885820
• rdRECEIPT test revert: git revert d534bb9
• Ticket reopening: ticket open ... on rdmsm4x

Outstanding Actions

None. All tests green, all remotes synced, tickets updated, zero blocking stalls.