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docs: refresh README for long-horizon personal agents #7551

Job	Run time
changes	1m 24s
dashboard-acceptance	1s
stage2c (${{ matrix.suite }} ${{ matrix.shard }})	1s
node-forward-compatibility	1s
test-shard	1s
node-minimum-compatibility	1s
presentation	1s
merge-gate	10s
kernel-static-checks	1s
windows-powershell	1s
checks	1s
stage2c-correctness-e2e	1s
pytest	1s
sonar	0s
	1m 45s