feat(bench): performance lane + task-matrix chart; docs: README rebuilt around four evidence lanes

- benchmarks/perf_suite.py: fixed headless workloads (2k creates, 10k build/export/reopen, 10k region query, premium quality pass) timed through the same backend methods the tools call; machine fingerprint recorded; self-measurement only
- benchmarks/render_perf_chart.py -> docs/assets/autocad-mcp-perf.svg (log-scale wall time)
- benchmarks/render_matrix_chart.py -> docs/assets/autocad-mcp-taskmatrix.svg (tasks x servers status heatmap from published reports)
- render_live_chart now tolerates other lanes sharing results/published/
- README: PyPI-first install, four-lane benchmark section with Python-generated visuals, v1.4 feature table, updated client/config/roadmap
- published perf report: benchmarks/results/published/perf-ezdxf.json

Co-authored-by: Cursor <cursoragent@cursor.com>

CHANGELOG.md

@@ -7,6 +7,25 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- **Headless performance lane** (`benchmarks/perf_suite.py` +
+  `render_perf_chart.py`): fixed wall-time workloads (2k individual creates,
+  10k build/export/reopen roundtrip, 10k region query, full premium quality
+  pass) measured through the same backend methods the MCP tools call;
+  machine fingerprint recorded, self-measurement only.
+- **Task-matrix chart** (`benchmarks/render_matrix_chart.py`): tasks × servers
+  status heatmap rendered from the published live-run reports, so coverage
+  gaps are visible per capability instead of one folded score.
+
+### Changed
+
+- README rebuilt: PyPI-first install, a four-lane benchmark section with
+  Python-generated visuals (scores, task matrix, performance, source review),
+  v1.4 feature table, updated client/config/roadmap sections.
+- `render_live_chart` now skips non-task-matrix reports so multiple lanes can
+  share `benchmarks/results/published/`.
+
 _Next (1.5): screenshot overlay + handle grounding v1, ezdxf redo (forward
 snapshots), COM `block_create_from_entities`, ISO 286 transition/interference
 hole letters (delta rule), titleblock on paper-space layouts._