selectrum: improve ivy parity

- add `:pg` bindings
- add `selectrum-minibuffer-map` to `+default-minibuffer-maps`
- add `consult-notmuch`
- add selectrum option for `mu4e-completing-read-function`
- document more parity failings

modules/email/mu4e/config.el

@@ -42,10 +42,11 @@
         mu4e-context-policy 'pick-first
         ;; compose with the current context, or ask
         mu4e-compose-context-policy 'ask-if-none
-        ;; use helm/ivy
+        ;; use helm/ivy/selectrum
         mu4e-completing-read-function
-        (cond ((featurep! :completion ivy) #'ivy-completing-read)
-              ((featurep! :completion helm) #'completing-read)
+        (cond ((featurep! :completion ivy)       #'ivy-completing-read)
+              ((featurep! :completion helm)      #'completing-read)
+              ((featurep! :completion selectrum) #'completing-read)
               (t #'ido-completing-read))
         ;; no need to ask
         mu4e-confirm-quit nil

modules/email/notmuch/config.el

@@ -103,3 +103,9 @@ OR a shell command string such as
   :when (featurep! :completion helm)
   :commands helm-notmuch
   :after notmuch)
+
+
+(use-package! consult-notmuch
+  :when (featurep! :completion selectrum)
+  :commands consult-notmuch
+  :after notmuch)

modules/email/notmuch/packages.el

@@ -8,3 +8,5 @@
   (package! counsel-notmuch :pin "a4a1562935e4180c42524c51609d1283e9be0688"))
 (when (featurep! :completion helm)
   (package! helm-notmuch :pin "97a01497e079a7b6505987e9feba6b603bbec288"))
+(when (featurep! :completion selectrum)
+  (package! consult-notmuch :pin "67cf219fcce211237347a783ce6982402341d5fd"))