README: clone over HTTPS, so the first command works for a stranger

The quickstart opened with the SSH clone URL, which is the one I used and the one
nobody else can. SSH requires a key registered against an account with access; an
anonymous visitor has neither, so the very first line of a public README would have
failed for every reader it was written for -- and failed with a permission error that
reads like the repository does not exist.

HTTPS works for anyone, needs nothing configured, and is what a public clone should
be. Verified by cloning the HTTPS URL rather than assuming.

Found while auditing the repository ahead of making it public. The audit itself came
back clean: no real environment names, internal hostnames, paths or infrastructure
references anywhere in the tree or in any commit message across the whole history,
and the only architectural detail the commit messages mention is the same set of
sentences the README already states openly.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: ynwmiromind

README.md

@@ -8,7 +8,7 @@ afternoon.
 no network, no Docker.
 
 ```bash
-git clone git@github.com:ApodexAI/executable-world-examples.git
+git clone https://github.com/ApodexAI/executable-world-examples.git
 cd executable-world-examples
 
 python3 run_task.py --list