…ase 2

Framework upgrade artifact — covers all 8 features, 4 UAT sessions,
security mitigations, and infrastructure established during construction.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Framework upgrade artifact — all 7 bugs from UAT session 4 documented
with severity, status (all Fixed), and session summary table.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ADR-0001: Architecture selection (Python + PySide6 + VTK stack)
ADR-0002: Python 3.13 version selection (3.14 compatibility chain failure)
ADR-0003: Nuitka packaging with targeted --include-module for VTK
ADR-0004: STL as primary mesh format

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

All 7 init steps verified: remote repo, branch protection, CI pipeline,
project scaffolding, data model, pre-commit hooks, final verification.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Two documents covering the full public API:
- mesh-operations.md: data types, loader, exporter, analysis, repair, transform
- viewport.md: main window, viewport, info panel, transform dialog, VTK adapter

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Added: Engineering Principles (priority hierarchy + best practices),
Artifact Locations, Process enforcement commands, Context Health Check,
Phase 2 Completion Checkpoint, Phase 3-4 Documentation, UAT HTML template
reference, Qdrant Persistent Memory section.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Added <!-- Last Updated --> freshness markers to all 16 sections,
ADR cross-references in Section 3, UAT Plan table format, and
revision history entry.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Records approval date, key architecture decisions, scope, risk
assessment, and Phase 2 progress at time of snapshot.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Documentation artifact remediation: 10 new templates in templates/generated/,
UAT HTML template in templates/uat/, new artifact directories.

Process enforcement: process-checklist.sh state machine, pre-commit-gate.sh
commit gating, track-tool-usage.sh, updated session hooks and scripts.

Updated framework reference docs (builders-guide, governance, user-guide).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dedicated measure mode (M key), point-to-point surface distance,
3-measurement FIFO cap, info panel display, vtkCellPicker ray-cast.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vtkImplicitPlaneWidget2 for direct manipulation, floating overlay
with X/Y/Z presets and Reset, vtkClipClosedSurface for interior
fill with terracotta cap color, C key toggle.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Feature 9 (Measurement Tool): 8 tasks covering Measurement dataclass,
MeasurementManager, vtkCellPicker ray-cast, info panel section,
measure mode with event filter, FIFO replacement, invalidation.

Feature 10 (Cross-Section Slice Plane): 8 tasks covering
SlicePlaneManager with vtkClipClosedSurface, SliceOverlayWidget,
vtkImplicitPlaneWidget2 interaction, preset positioning, Nuitka config.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…MeasurementManager

Task 1: Measurement frozen dataclass + compute_distance function
Task 2: MeshDocument.measurements list with add_measurement (3-max FIFO),
        clear_measurements, and next_measurement_index (gap-filling)
Task 3: MeasurementManager creates VTK line + endpoint marker actors
        with 3 colorblind-safe colors (amber, sky blue, light green)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Tasks 4-6:
- pick_surface_point using vtkCellPicker for ray-mesh intersection
- show/hide measurements + pending point actor lifecycle in SceneManager
- Measurements collapsible section in InfoPanel with color indicators,
  distance, and coordinates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…o MainWindow

Tasks 7-8:
- M key toggle for dedicated measurement mode with crosshair cursor
- Event filter on VTK interactor: click (not drag) places points
- Qt-to-VTK Y-flip for correct ray-cast coordinates
- Clear Measurements action in Edit menu
- _invalidate_measurements called from transform, repair, undo, redo, load
- 30 UI tests covering actions, mode toggle, clear, and invalidation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Fixes mypy attr-defined errors — QEvent doesn't have button() or
position(), but QMouseEvent does. isinstance check narrows the type.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Verifies that non-QMouseEvent events (e.g., FocusIn) pass through
the measure mode event filter without error.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Covers the fix: sort imports commit — verifies Measurement and
MeshData are both importable from mesh_data module.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>