feat: analyze_iperf_angle_sweep MCP tool

New MCP tool that ingests two bench iperf sessions (installed antenna
+ reference antenna) at matched azimuth angles and computes per-cell
delta statistics — mean, median, worst-angle, best-angle, spread,
p10/p90 — plus a polar PNG per (channel, mode) and a markdown report
with a configurable verdict threshold.

The tool reads only the documented session.json shape (wifi_only runs
with angle_deg + aggregate.overall_mbps populated). No bench-code
dependency; failures surface in `warnings`, never raise. 8 unit tests
cover happy path, CSV/JSON shape, cell-set intersection, angle-set
intersection, verdict thresholds, missing manifest, malformed runs,
and non-wifi_only ignored.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: RFingAdam

rflect-mcp/server.py

@@ -32,6 +32,7 @@
 from tools.uwb_tools import register_uwb_tools
 from tools.cal_drift_tools import register_cal_drift_tools
 from tools.orchestration import register_orchestration_tools
+from tools.iperf_angle_tools import register_iperf_angle_tools
 
 # Create MCP server
 mcp = FastMCP("rflect")
@@ -44,6 +45,7 @@
 register_uwb_tools(mcp)
 register_cal_drift_tools(mcp)
 register_orchestration_tools(mcp)
+register_iperf_angle_tools(mcp)
 
 
 @mcp.resource("rflect://status")