A plan may ask for a place

`type: location` on a field is portal 0.4.0's map pin, stored as
lat/lon/zoom. The reference tells the model it needs `optional: true`,
since a map needs a browser that can draw one.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/plan.rs

@@ -102,7 +102,9 @@ needs:
                               # the intake says about them: someone on a phone with gloves
                               # on gets 3, a first enquiry 4 to 6, a firm's paperwork 5 to 6
     collects:                 # the form; name is snake_case ASCII, type one of
-                              # text (default), email, tel, textarea, date, select
+                              # text (default), email, tel, textarea, date, select, location
+                              # (a pin on a map, stored as lat/lon/zoom; optional: true,
+                              # since a map needs a browser that can draw one)
       - { name: name }
       - { name: phone, type: tel }
       - { name: problem, type: textarea }