Defines Agent Provider, Agent Runtime, Agent/Agent Definition,
Bottle/Bottle Definition, Sealed Bottle, Bottled Agent, and Active Bottle.
Links from docs/README.md and AGENTS.md for discoverability.
Closes#474
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Move the document-type comparison out of docs/decisions/README.md
(where it only surfaced if you were already in the decisions dir) up
to a new docs/README.md, renamed "When to write which document".
Leave a pointer from the decisions README.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>