feat(engineering): add autocad-expert and automotive-embedded skills

engineering/autocad-expert/SKILL.md

@@ -0,0 +1,123 @@
+---
+name: "autocad-expert"
+description: "Use when the user asks to create engineering drawings, manage CAD layers, set up dimensions and annotations, work with AutoCAD blocks, configure plot styles, or export DWG/DXF/PDF files."
+---
+
+# AutoCAD Expert
+
+## Overview
+
+A comprehensive AutoCAD skill for 2D engineering drafting, layer management, annotation, block creation, and plot-ready output. Covers architectural, mechanical, civil, and electrical disciplines following ASME Y14.5 and ISO 128 standards.
+
+## Core Competencies
+
+### 2D Drafting
+- **Geometry Creation**: Lines, polylines, arcs, circles, splines with exact coordinates
+- - **Editing Commands**: Trim, extend, offset, fillet, chamfer, array, mirror, stretch
+  - - **Coordinate Systems**: World vs User Coordinate System; absolute, relative, polar input
+    - - **Object Snaps**: Endpoint, midpoint, center, intersection, perpendicular, tangent
+      - - **Precision Drawing**: Ortho, polar tracking, grid snap, object snap tracking
+
+        - ### Layer Management
+        - - **Layer Standards**: Industry naming (A-WALL-CONSTR, M-PIPE-SUPL, E-POWR-LITE)
+          - - **Layer Properties**: Color, linetype, lineweight, plot style, transparency
+            - - **Layer States**: Save and restore visibility configs for review sets
+              - - **Layer Filters**: Property and group filters for large drawings
+                - - **Audit & Cleanup**: Purge unused layers; enforce with CAD Standards Checker
+
+                  - ### Dimensioning & Annotation
+                  - - **Dimension Types**: Linear, aligned, angular, radius, diameter, ordinate, baseline
+                    - - **GD&T**: Geometric tolerances per ASME Y14.5 using TOLERANCE command
+                      - - **Annotative Scaling**: Annotative dimensions and text for automatic viewport scaling
+                        - - **Text & Tables**: MTEXT, DTEXT, TABLE; field codes for dynamic values
+                          - - **Leaders**: MLEADER with arrowhead styles; standard callout blocks
+
+                            - ### Block Library
+                            - - **Static Blocks**: Title blocks, north arrows, section markers, standard symbols
+                              - - **Dynamic Blocks**: Parameters and actions for parametric components (doors, valves)
+                                - - **Block Attributes**: ATTDEF, ATTEDIT, ATTEXT for automated BOMs and schedules
+                                  - - **Xrefs**: Attach, overlay, bind, and reload external references
+
+                                    - ### Sheet & Plot Setup
+                                    - - **Layouts**: Model space vs paper space; multiple layouts per project
+                                      - - **Viewports**: MVIEW, VPCLIP, VPLAYER for per-viewport layer overrides
+                                        - - **Plot Styles**: CTB (color-dependent) vs STB (named); lineweight mapping
+                                          - - **Publish**: Multi-sheet PDF/DWF export via PUBLISH command
+
+                                            - ## Decision Framework
+
+                                            - | Gate | Question | Action |
+                                            - |------|----------|--------|
+                                            - | Discipline | Architecture, mechanical, civil, or electrical? | Apply discipline layer standard |
+                                            - | Units | Imperial (inches) or metric (mm)? | Set at file creation with UNITS |
+                                            - | Output | PDF, DWF, or physical plot? | Define plot style and page setup |
+                                            - | Version | Minimum DWG version required? | SAVEAS to compatible format |
+                                            - | Scale | Drawing scale for annotation? | Set annotative scale or DIMSCALE |
+
+                                            - ## Command Quick Reference
+
+                                            - | Category | Command | Alias | Purpose |
+                                            - |----------|---------|-------|---------|
+                                            - | Draw | LINE | L | Create line segments |
+                                            - | Draw | POLYLINE | PL | Connected polyline |
+                                            - | Draw | CIRCLE | C | Create circle |
+                                            - | Edit | TRIM | TR | Trim to boundary |
+                                            - | Edit | OFFSET | O | Offset by distance |
+                                            - | Edit | ARRAY | AR | Rectangular or polar array |
+                                            - | Annotation | DIMLINEAR | DLI | Linear dimension |
+                                            - | Annotation | MTEXT | MT | Multiline text |
+                                            | Annotation | MLEADER | MLD | Multileader callout |
+| Layer | LAYER | LA | Layer Properties Manager |
+| Block | BLOCK | B | Define block |
+
+| Block | INSERT | I | Insert block || Block | XREF | XR | External reference manager |
+| Plot | PUBLISH | — | Multi-sheet publish |
+
+## Layer Naming Conventions
+
+| Discipline | Prefix | Example | Content |
+|-----------|--------|---------|---------|
+| Architecture | A- | A-WALL-CONSTR | Construction walls |
+| Mechanical | M- | M-PIPE-SUPL | Supply piping |
+| Electrical | E- | E-POWR-LITE | Power/lighting |
+| Civil | C- | C-ROAD-CNTR | Road centerlines |
+| Structural | S- | S-BEAM-WIDE | Wide flange beams |
+| General | G- | G-ANNO-DIMS | Dimensions |
+
+## Risk & Troubleshooting
+
+| Problem | Cause | Solution |
+|---------|-------|----------|
+| Objects won't trim | Boundary not co-planar | Check Z elevation; use edge mode |
+| Wrong dimension value | Snap to wrong point | Use OSNAP overrides; verify endpoint |
+| Plot is blank | Layer frozen or viewport off | Check LAYER visibility; activate viewport |
+| Xref not loading | Path broken | XREF RELOAD; verify path and DWG version |
+| Hatch invisible | Boundary not closed | Use BOUNDARY to create closed polyline |
+| Slow performance | Proxy objects or duplicates | OVERKILL; PURGE unused objects |
+
+## Standard Workflow
+
+```
+Standards Setup  -> Set units, layers, dim styles, text styles
+Template (DWT)   -> Save preconfigured template for reuse
+Drawing          -> Geometry on correct layers with precision
+Annotation       -> Dimensions, text, symbols at annotative scale
+Blocks           -> Standard symbols; dynamic components
+Layout/Plot      -> Viewports, plot style, page setup
+Output           -> Publish to PDF/DWF or plot to printer
+```
+
+## Related Skills
+
+| Combination | Workflow |
+|-------------|----------|
+| AutoCAD + Revit | DWG underlays for BIM coordination |
+| AutoCAD + Civil 3D | Survey and alignment data exchange |
+| AutoCAD + Inventor | 2D drawings from 3D parametric model |
+| AutoCAD + SolidWorks | DWG/DXF interchange for mechanical |
+
+## Cross-References
+
+- **automotive-embedded** — embedded C/C++ for vehicle systems using CAD-generated schematics
+- - **database-designer** — store drawing metadata, revision history, and BOM data
+  - - **spec-driven-workflow** — drive CAD drawing requirements from specifications