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roadmap say so: criterion 5 is withdrawn (track D, Plant 3D, dropped) and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

tests/test_benchmark_v7.py

@@ -10,6 +10,9 @@ A/B report.
 
 from __future__ import annotations
 
+import json
+from pathlib import Path
+
 import ezdxf
 import pytest
 
@@ -36,6 +39,19 @@ def test_v7_extends_v6_without_touching_it():
     assert task_by_id("understand_foreign").category == "understand"
 
 
+def test_the_published_reference_report_covers_the_whole_current_matrix():
+    # The release's reference run: every task of the current matrix, all passed.
+    # It replaces 1.5's v3 run; the competitor reports stay the v2 runs.
+    published = Path(__file__).resolve().parents[1] / "benchmarks" / "results" / "published"
+    report = json.loads((published / "autocad-mcp-pro.json").read_text(encoding="utf-8"))
+    scored = {item["task_id"] for item in report["results"]}
+
+    assert scored == {task.task_id for task in TASKS_V7}
+    assert report["matrix"] == DEFAULT_MATRIX == "v7"
+    assert report["summary"]["score"] == 100.0
+    assert {item["status"] for item in report["results"]} == {"pass"}
+
+
 def test_the_adapter_implements_every_v7_task():
     from benchmarks.adapters.autocad_mcp_pro import AutoCADMCPProAdapter