docs: adopt per-round files + LLM counterparts; add llm versions for 00-bootstrap and 01-codexhelper; update AGENTS and SeedPrompt

SeedPrompt.md

@@ -55,3 +55,9 @@ Commit/push everything in the repo now before we get started on the project.
 
 - Start with questions in `collab/questions/` and keep iterating/adding questions until satisfied or instructed to move on.
 - Do not create proposals or plans until the questions file has been edited by the user and the user gives explicit approval.
+
+### Files Per Round + LLM Copies
+
+- Use multiple files per round rather than growing a single document.
+- Naming: `collab/<type>/NN-<subject>.md` (human) and `collab/<type>/NN-<subject>.llm.md` (LLM-optimized).
+- Start a new `NN` for each major round; keep subject consistent across types.