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Update README to simplify agent documentation #296

Job	Run time
Pyright (macos-latest)	24s
pip-audit (dependency CVEs) (ubuntu-latest)	22s
Tests (py3.11 on macos-latest)	2m 3s
Tests (py3.11 on ubuntu-latest)	1m 13s
Pyright (ubuntu-latest)	23s
Build wheel, install & CLI smoke test (ubuntu-latest)	19s
Ruff (lint + format) (macos-latest)	25s
Tests (py3.12 on ubuntu-latest)	1m 24s
Ruff (lint + format) (ubuntu-latest)	28s
Build wheel, install & CLI smoke test (macos-latest)	23s
Tests (py3.13 on macos-latest)	2m 2s
pip-audit (dependency CVEs) (macos-latest)	23s
Tests (py3.12 on macos-latest)	2m 5s
Tests (py3.13 on ubuntu-latest)	1m 12s
	13m 6s