release: 1.6.0

The v1.6 roadmap in five tracks: 154 -> 247 registered tools in 28 groups.

Evidence re-measured for the release:
- correctness A/B against v1.5.1: 26/48 -> 48/48, 22 fixed, 0 regressed
  (ab-v1.5.1-vs-v1.6.0.json, replacing the -dev report);
- the reference adapter on matrix v7: 21/21 (autocad-mcp-pro.json, which
  was the v3 run of 1.5); the published-report test follows it to v7;
- the 100-point rubric re-scored per category, every withheld point named:
  93 (the competitor rows are their July snapshots, not re-reviewed);
- the perf lane as medians of five alternating runs, beside a v1.4.0
  comparison on one interpreter (perf-v1.4.0-vs-v1.6.0.json).

Two roadmap criteria are not green, and the changelog, the README and the
roadmap say so: criterion 5 is withdrawn (track D, Plant 3D, dropped) and
criterion 7 is not met (creation 1.25x / 1.38x v1.4.0's time, still
1.17x / 1.20x with the timeout off). Carried to 1.7.

README rewritten for 1.6: what is new, the mechanical and architectural
sheets, the rubric and task-matrix charts, the measured limits (including
the four feature tables that ship empty), and the 1.7 roadmap. server.json
describes the 1.6 surface and declares TOOL_PACKS. CLAUDE.md corrects the
ISO 286 letter set and the empty feature tables.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "autocad-mcp-pro"
-version = "1.5.1"
+version = "1.6.0"
 description = "Production-grade AutoCAD MCP server — COM API + ezdxf dual engine"
 readme = "README.md"
 requires-python = ">=3.11"
@@ -151,6 +151,10 @@ only-include = [
 [tool.ruff]
 line-length = 100
 target-version = "py311"
+# Design documents and implementation plans quote code as illustration; ruff
+# 0.16 formats Markdown code blocks, and reflowing a plan's quoted code would
+# change what the document says was written.
+extend-exclude = ["docs/superpowers"]
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "W", "UP", "B"]