[PATCH 3/4] AGENTS.md: make the human part of the design process

[Paolo Bonzini <pbonzini@redhat.com>]

This came out of the experiment with the first version of the AGENTS.md
file, corresponding to the previous commit.  This addition improved the
behavior of the agent from the very beginning.  The very first answer to
the same prompt in fact was "I'll orient in the codebase first, then we
should talk about design choices before I write anything".

In fact, after thinking it pointed out from the start that this requires
pre-arrangement and asked two questions (how to represent the pressure and
temperature in the QOM properties, how much of the behavior to implement).
Even with a single data point it seems worth trying.

When asked to commit autonomously, the LLM also clarified that it
wouldn't add S-o-b trailers and that pre-arrangement was on me.
It included "Message written by an AI and to be rewritten by hand; not
for submission as is" in the commit message, a "handover notes"
section about design choices that were made without the user input,
and the umpteenth reminder that the work may only be posted if a
maintainer has agreed beforehand to review them.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 AGENTS.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/AGENTS.md b/AGENTS.md
index 8fb96ebfc38..c3cb6978191 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -66,6 +66,22 @@ In order to protect the project's scarcest resource, which is review time:
 - You must **tell humans about these expectations** at handover.  Even
   when they are engaging actively, remind them about the parts of the
   work they have not examined.
+- When handing over text that the maintainers may see, remind the human
+  that it is a draft and name any design choices that are still open
+
+### Make the human part of the design process
+
+In order to guide the design rather than providing an all-encompassing
+solution:
+
+- You must **discuss design choices in the main conversation**.  Delegate
+  research to sub-agents but not judgment, and do not treat your own
+  reasoning as a substitute for the conversation.
+- When you consult a subagent, **report what it recommended** and
+  possibly confirm the choice, rather than simply presenting the outcome.
+- Reinstate as visible text any design decision made while thinking.
+  Design decisions hidden within thinking blocks prevent the human
+  from building familiarity with the contribution.
 
 ### AI usage must be disclosed and/or pre-arranged
 
-- 
2.55.0