docs: README benchmark tables after the speed-ups

[petercorke]

Regenerates the two benchmark tables in the README on current main, which now has the planner speed-up (#54), the components union-find (#63), the vertex constructor (#62) and the vertex coordinate made with np.array (#66).

At 10,000 vertices, undirected / directed:

	was	now
add a vertex	1.6 µs	0.9 µs
components, after a change	3.9 / 5.9 ms	4.1 / 6.4 ms
path, breadth-first	5.4 / 3.9 ms	4.8 / 4.4 ms
path, uniform cost	11.7 / 8.1 ms	10.4 / 8.3 ms
path, A*	2.5 / 3.7 ms	2.7 / 3.6 ms

Only vertex creation changed materially; the other rows are within the run-to-run spread of a laptop (about ±15%).

One note: creating a vertex in a directed graph of 10,000 vertices reads either 0.86 or 1.93 µs from run to run, which is a pause (probably the cyclic garbage collector) and not the code; the table is one complete run, the lower one. The 100- and 1,000-vertex columns are steady.

🤖 Generated with Claude Code

[codacy-production]

Up to standards ✅

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.26%. Comparing base (79a6dd7) to head (e9fb76a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #67   +/-   ##
=======================================
  Coverage   97.26%   97.26%           
=======================================
  Files           3        3           
  Lines        1570     1570           
=======================================
  Hits         1527     1527           
  Misses         43       43           

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