Remove sample results and notes from perf.md

Removed sample benchmark results and notes from performance documentation.

Author: Snider

docs/perf.md

@@ -72,63 +72,3 @@ BenchmarkNearest_10k_4D_Gonum_Uniform-8   50000  12,300 ns/op   0 B/op   0 alloc
 - Local (Gonum): `go test -tags=gonum -bench . -benchmem -run=^$ ./...`
 - CI artifacts: download `bench-linear.txt` and `bench-gonum.txt` from the latest workflow run.
 - Optional: add historical trend graphs via Benchstat or Codecov integration.
-
-## Sample results (from a recent local run)
-
-Results vary by machine, Go version, and dataset seed. The following run was captured locally and is provided as a reference point.
-
-- Machine: darwin/arm64, Apple M3 Ultra
-- Package: `github.com/Snider/Poindexter`
-- Command: `go test -bench . -benchmem -run=^$ ./... | tee bench.txt`
-
-Full output:
-
-```
-goos: darwin
-goarch: arm64
-pkg: github.com/Snider/Poindexter
-BenchmarkNearest_Linear_Uniform_1k_2D-32          	 409321	      3001 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Gonum_Uniform_1k_2D-32           	 413823	      2888 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Linear_Uniform_10k_2D-32         	  43053	     27809 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Gonum_Uniform_10k_2D-32          	  42996	     27936 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Linear_Uniform_1k_4D-32          	 326492	      3746 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Gonum_Uniform_1k_4D-32           	 338983	      3857 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Linear_Uniform_10k_4D-32         	  35661	     32985 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Gonum_Uniform_10k_4D-32          	  35678	     33388 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Linear_Clustered_1k_2D-32        	 425220	      2874 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Gonum_Clustered_1k_2D-32         	 420080	      2849 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Linear_Clustered_10k_2D-32       	  43242	     27776 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_Gonum_Clustered_10k_2D-32        	  42392	     27889 ns/op	       0 B/op	       0 allocs/op
-BenchmarkKNN10_Linear_Uniform_10k_2D-32           	   1206	    977599 ns/op	  164492 B/op	       6 allocs/op
-BenchmarkKNN10_Gonum_Uniform_10k_2D-32            	   1239	    972501 ns/op	  164488 B/op	       6 allocs/op
-BenchmarkKNN10_Linear_Clustered_10k_2D-32         	   1219	    973242 ns/op	  164492 B/op	       6 allocs/op
-BenchmarkKNN10_Gonum_Clustered_10k_2D-32          	   1214	    971017 ns/op	  164488 B/op	       6 allocs/op
-BenchmarkRadiusMid_Linear_Uniform_10k_2D-32       	   1279	    917692 ns/op	  947529 B/op	      23 allocs/op
-BenchmarkRadiusMid_Gonum_Uniform_10k_2D-32        	   1299	    918176 ns/op	  947529 B/op	      23 allocs/op
-BenchmarkRadiusMid_Linear_Clustered_10k_2D-32     	   1059	   1123281 ns/op	 1217866 B/op	      24 allocs/op
-BenchmarkRadiusMid_Gonum_Clustered_10k_2D-32      	   1063	   1149507 ns/op	 1217871 B/op	      24 allocs/op
-BenchmarkNearest_1k_2D-32                         	 401595	      2964 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_10k_2D-32                        	  42129	     28229 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_1k_4D-32                         	 365626	      3642 ns/op	       0 B/op	       0 allocs/op
-BenchmarkNearest_10k_4D-32                        	  36298	     33176 ns/op	       0 B/op	       0 allocs/op
-BenchmarkKNearest10_1k_2D-32                      	  20348	     59568 ns/op	   17032 B/op	       6 allocs/op
-BenchmarkKNearest10_10k_2D-32                     	   1224	    969093 ns/op	  164488 B/op	       6 allocs/op
-BenchmarkRadiusMid_1k_2D-32                       	  21867	     53273 ns/op	   77512 B/op	      16 allocs/op
-BenchmarkRadiusMid_10k_2D-32                      	   1302	    933791 ns/op	  955720 B/op	      23 allocs/op
-PASS
-ok  	github.com/Snider/Poindexter	40.102s
-PASS
-ok  	github.com/Snider/Poindexter/examples/dht_ping_1d	0.348s
-PASS
-ok  	github.com/Snider/Poindexter/examples/kdtree_2d_ping_hop	0.266s
-PASS
-ok  	github.com/Snider/Poindexter/examples/kdtree_3d_ping_hop_geo	0.272s
-PASS
-ok  	github.com/Snider/Poindexter/examples/kdtree_4d_ping_hop_geo_score	0.269s
-```
-
-Notes:
-- The first block shows dual-backend benchmarks (Linear vs Gonum) for uniform and clustered datasets at 2D/4D with N=1k/10k.
-- The final block includes the legacy single-backend benchmarks for additional sizes; both are useful for comparison.
-
-To compare against the optimized KD backend explicitly, build with `-tags=gonum` and/or download `bench-gonum.txt` from CI artifacts.