v3.20.73

Changelog

• 1293c01 chore(examples): embed the demo project, not the demo's leftovers
• bc99488 chore: bump version to v3.20.73 [skip-release] [skip ci]
• ff34c55 docs(config): document the two sampling keys and the environment's variables
• c11796b docs(env): running the environment as a container
• fca2e86 docs(website): an Environment section, because the site said this did not exist
• d7281a2 docs(website): put the training environment on the homepage
• 3764d16 feat(env): boot with nothing mounted, and refuse the wrong world
• b3e4329 feat(env): build the environment image
• b58d634 feat(env): configure a served environment the way a container is configured
• 95562c3 feat(env): give external agents a URL they can actually reach
• 58ca690 feat(env): say what you are, what you cost, and whether you are ready
• 92c7e00 feat(release): publish the agent environment image [minor]
• 9488cea feat(skills): a skill for driving the environment, and one for working on it
• 90b9638 feat(training): make the client installable
• b3aa445 fix(ci): give the package suite a timeout, so a green build is not 43s from red [minor]
• 14e090c fix(demo): anchor a freshly seeded world to the day it was pinned to
• 7a114a1 fix(website): follow the watch copy to /watch/ in the site checker
• 3b1d23a test(website): derive the docs' facts from code instead of trusting prose