Require commits for completed work

AGENTS.md

@@ -191,6 +191,11 @@ guaranteed to have.
 
 ## Checking your work
 
+- **Commit completed work.** Once a coherent piece of work has passed its
+  relevant checks and has no known major issue or unresolved design decision,
+  commit it rather than leaving it in the worktree. Keep independently
+  completed slices in separate commits.
+
 - **Rust**: `./scripts/run-tests.sh` from the repo root runs `event-model`,
   `server/` and `app-rust/`; `cd iris && cargo test` runs the framework's
   own suite, which is slower and not about this product. Each workspace