plan: the guidance names records that answer records, members-only needs and a group contact

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/plan.rs

@@ -149,9 +149,25 @@ rest. Each is one line in the plan, and the builder does the wiring:
   a note. `moves_by: { <stage>: [submitter] }` gives them a move of
   their own through their link: confirm, withdraw, say it is solved.
 - **Let a decision do the work.** `grants` makes an approval into
-  membership; `deadlines` lets a stage end on its own (a notice that
-  expires, a request nobody took up); `invites_by` lets a desk bring a
-  person in without anyone touching an admin tool.
+  membership: the person gets an account and a place in the group the
+  moment the case gets there; `deadlines` lets a stage end on its own
+  (a notice that expires, a request nobody took up); `invites_by` lets
+  a desk bring a person in without anyone touching an admin tool.
+- **Let one record answer another.** A need `about` another need is
+  one answer per record of it, from that record's own row on the
+  public list: a neighbour saying "I can lend you that" to a notice, a
+  bid to a request. `mails: { open: owner }` sends the answer straight
+  to whoever posted the record, and the site keeps no queue - the
+  poster's inbox is the queue. The site never becomes a go-between.
+- **Keep some things for members.** A need with `door` and `enters_as`
+  is offered to everyone on the door and taken on the group's page
+  behind sign-in, with name and address filled from the account: a
+  seat on a committee for members, a discount for customers. The
+  group is one a decision `grants`, so nobody has to be waved in.
+- **Answer for the pages as a group.** `contact: { name, email, group }`
+  makes the contact a group's inbox rather than a person: no account
+  is made for it, and every member of the group may suggest changes
+  to the pages from the page itself.
 - **Make the choices real.** `groups` with labels, and a select with
   `options_from: groups`, so a form offers exactly the committees or
   teams that exist; `multiple: true` where a person can pick several.
@@ -167,8 +183,9 @@ Rules:
 - Groups are the roles the intake names, as snake_case identifiers.
 - The front door opens with `does` (at most two features, one role
   each) and `shows`, then holds at most seven offers: doors plus needs
-  with no door. A door with no need behind it, or a door on a need with
-  `enters_as`, is refused. A role `does` speaks for must have a move
+  with no door. A door with no need behind it is refused; a door on a
+  need with `enters_as` is the way to the members' page. A role `does`
+  speaks for must have a move
   of its own after sending (`moves_by` with `submitter`) or a public
   view, or it is a spectator.
 - Every need whose form collects an email should tell the person on