the cart agreement, v0

Published to give the document an address.

The README states what the agreement depends on (annotating/v0), the four roles
it leaves to adopters, and the one among them that is not a preference — when one
party cannot feel a cost, the decision belongs to the party who can, and an agent
will not feel a cart filling.

Also states what is known and unresolved: an out-of-scope need has no exit.
Conversion emits the artifact and the declines, and a thing that came up, was
correctly out of scope, and was neither refused nor decided is neither of those,
so today "out of scope" means "lost". Proposed as a third exit, not adopted, and
loom's to make.

This is the copy adopted by staribridge/substrate on 2026-08-21 and reconciled to
v0 the same day, read many times and never edited. If loom's own copy differs,
this one is wrong.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -0,0 +1,46 @@
+# cart
+
+**How two parties work out what something means before one of them changes it —
+including when neither of them knows.**
+
+- [The agreement](.loom/published/cart.md) — `v0`
+
+**A cart is one bounded exchange.** *It starts, it runs, it **converts**, and then
+it is gone. The directory is only where a cart happens.*
+
+## What it depends on
+
+**[`annotating/v0`](https://git.hypertheory-labs.dev/loom/annotating).** *Dailies
+are annotated, and everything here rests on that.*
+
+## Four roles it leaves to you
+
+**An agreement adopted with these uncast has not been adopted. It has been
+filed.**
+
+- **Where a cart lives**
+- **What durable record declines go into**
+- **What isolates work in progress while a cart is open**
+- **Who decides when the round ends** — *and this one is not a preference.
+  **When one party cannot feel a cost, the decision belongs to the party who
+  can.** An agent will not feel a cart filling and will keep writing until told
+  to stop.*
+
+*The agreement asks these as prompts. **Answer them where you adopt it**, not
+here.*
+
+## Known and unresolved
+
+**An out-of-scope need has no exit.** *Conversion emits the artifact and the
+declines — and a thing that came up, was correctly out of scope, and was neither
+refused nor decided is neither of those.* **Today "out of scope" means "lost."**
+
+*Proposed as a third exit and not yet adopted; it is loom's to make. Recorded in
+[`bedrock`](https://git.hypertheory-labs.dev/loom/bedrock)'s event log, cart
+`almanac`.*
+
+## Provenance of this copy
+
+**Adopted by `staribridge/substrate` on 2026-08-21 and reconciled to `v0` the
+same day.** *Read many times, never edited.* **If loom's own copy differs, this
+one is wrong and should be replaced before anybody adopts it.**