README: the proposal loop as it now runs (draft PR on submission)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -133,13 +133,18 @@ entirely in this repo, in this order:
    and its workflow must be updated in lockstep.
 
 5. **Change the system through itself.** `/develop/proposal` takes a
-   proposed replacement for any content file (`questions/*.yaml` or
-   `aggregates.yaml` — nothing else is in scope) — from a person, or
-   eventually a locally-run model, through the same public form. An
-   owner approves it on `/develop`; approval triggers the automation
-   that branches, commits, opens a PR, and merges only when the same
-   lint that gates every human push passes. Nothing merges on
-   autopilot.
+   proposed replacement for any content file (the `questions/` tree,
+   `aggregates.yaml`, or `site.yaml` — nothing else is in scope) —
+   from a person, or eventually a locally-run model, through the same
+   public form. The submission itself becomes a branch and a draft
+   pull request at once (n8n "Portal: proposal received"), so lint
+   reports on it immediately and the submitter gets one
+   acknowledgement mail if they left an address. An owner approves it
+   on `/develop`; approval un-drafts the PR and merges it once the
+   same lint that gates every human push passes ("Portal: commit
+   approved development proposal"). Nothing merges on autopilot. The
+   alternative is `disabled: true` while this loop is being finished —
+   announced, not yet open.
 
 ## Voice