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roadmap say so: criterion 5 is withdrawn (track D, Plant 3D, dropped) and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

benchmarks/results/published/perf-ezdxf.json

@@ -14,23 +14,37 @@
         "entity_count": 2000
       },
       "metric": "entities_per_second",
-      "metric_value": 5715.8,
-      "wall_ms": 349.9,
-      "workload_id": "create_lines_2k"
+      "wall_ms": 306.1,
+      "workload_id": "create_lines_2k",
+      "runs_ms": [
+        287.6,
+        373.6,
+        298.2,
+        425.1,
+        306.1
+      ],
+      "metric_value": 6533.8
     },
     {
       "description": "Create 10,000 lines, export DXF, reopen and verify",
       "detail": {
-        "build_ms": 1633.1,
+        "build_ms": 2149.4,
         "entity_count": 10000,
-        "export_ms": 273.0,
-        "file_bytes": 1369663,
-        "reopen_ms": 272.1
+        "export_ms": 516.6,
+        "file_bytes": 1369662,
+        "reopen_ms": 535.2
       },
       "metric": "entities_per_second",
-      "metric_value": 4590.8,
-      "wall_ms": 2178.3,
-      "workload_id": "roundtrip_10k"
+      "wall_ms": 2553.5,
+      "workload_id": "roundtrip_10k",
+      "runs_ms": [
+        3201.3,
+        2550.0,
+        3118.3,
+        2553.5,
+        2289.4
+      ],
+      "metric_value": 3916.2
     },
     {
       "description": "Crossing-selection region query over 10,000 entities",
@@ -39,8 +53,15 @@
       },
       "metric": "entities_matched",
       "metric_value": 2500.0,
-      "wall_ms": 2466.9,
-      "workload_id": "region_query_10k"
+      "wall_ms": 712.2,
+      "workload_id": "region_query_10k",
+      "runs_ms": [
+        712.2,
+        806.7,
+        295.1,
+        836.4,
+        300.6
+      ]
     },
     {
       "description": "Plate with hole: ISO layers, geometry, dimensions and full critique",
@@ -49,8 +70,16 @@
       },
       "metric": "critique_issues",
       "metric_value": 0.0,
-      "wall_ms": 255.7,
-      "workload_id": "premium_pass"
+      "wall_ms": 65.3,
+      "workload_id": "premium_pass",
+      "runs_ms": [
+        76.3,
+        65.3,
+        36.9,
+        83.8,
+        41.3
+      ]
     }
-  ]
+  ],
+  "aggregation": "median of 5 default-configuration runs, one machine, one interpreter"
 }