---
phase: 03.1-remove-virtual-tracker
plan: 02
subsystem: driver
tags: [openvr, steamvr, proximity, verification, hardware-validation]

# Dependency graph
requires:
  - phase: 03.1-remove-virtual-tracker (plan 01)
    provides: "Clean driver with no virtual tracker, SetHmdProximity() as sole mechanism"
provides:
  - "Hardware-validated confirmation that tracker-free driver works correctly in SteamVR"
  - "Updated verification script covering all Phase 03.1 success criteria"
  - "All 5 Phase 03.1 success criteria passed on real hardware"
affects: [04-hid-data-pipeline]

# Tech tracking
tech-stack:
  added: []
  patterns: [12-check-verification-script, negative-assertion-testing]

key-files:
  created: []
  modified:
    - scripts/verify_proximity.ps1

key-decisions:
  - "Verification script uses negative assertions (PASS if NOT found) for tracker removal checks"
  - "Phase 03.1 Success Criteria report replaces FEAS-03 feasibility gate in script output"

patterns-established:
  - "Negative check pattern: PASS when expected string is absent from vrserver log"
  - "Live pipe command testing: fire command, match response pattern, report PASS/FAIL"

requirements-completed: []

# Metrics
duration: 3min
completed: 2026-03-22
---

# Phase 03.1 Plan 02: Verify Clean Driver Summary

**Rewrote verification script for tracker-free checks and validated all 5 Phase 03.1 success criteria on hardware**

## Performance

- **Duration:** 3 min (script rewrite) + hardware validation checkpoint
- **Started:** 2026-03-22T09:48:00Z
- **Completed:** 2026-03-22T10:30:00Z
- **Tasks:** 2 (1 auto + 1 hardware checkpoint)
- **Files modified:** 1

## Accomplishments
- Rewrote verify_proximity.ps1 with 12 checks covering Phase 03.1 behavior (no-tracker negatives, HMD property writes, pipe commands, HID status)
- All 5 Phase 03.1 success criteria passed on real hardware:
  - SC-1: No tracker device in SteamVR device list
  - SC-2: SetBoolProperty on HMD container prevents dashboard reset
  - SC-3: Pipe commands (proximity on/off, status, fallback1 on/off) all work
  - SC-4: HID device opens successfully
  - SC-5: ProximityDevice class removed from source

## Task Commits

Each task was committed atomically:

1. **Task 1: Rewrite verify_proximity.ps1 for Phase 03.1 checks** - `0ac2833` (feat)
2. **Task 2: Hardware validation checkpoint** - no commit (human verification, approved)

## Files Created/Modified
- `scripts/verify_proximity.ps1` - Rewritten: 12 checks for Phase 03.1 (build artifacts, vrserver log no-tracker, live pipe commands, HMD property writes, negative checks), replaces Phase 3 /proximity component checks

## Decisions Made
- Used negative assertions (PASS when string NOT found) for tracker removal checks -- confirms absence of TrackedDeviceAdded and /proximity component
- Replaced FEAS-03 feasibility gate output with Phase 03.1 Success Criteria report (SC-1 through SC-5)

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Phase 03.1 fully validated: tracker-free driver works correctly with HMD property writes
- Driver is clean, minimal, and ready for Phase 4 (HID Data Pipeline) feature work
- All feasibility gates passed: driver coexistence (Phase 1), HID access (Phase 2), proximity mechanism (Phase 3/3.1)

## Self-Check: PASSED

All files, commits, and build outputs verified.

---
*Phase: 03.1-remove-virtual-tracker*
*Completed: 2026-03-22*