docs: remove references to deprecated show command

Update planning docs and audit tables to reflect the removal of
`lore show`:

- CLI_AUDIT.md: remove show row, renumber remaining entries
- plan-expose-discussion-ids.md: replace `show` with
  `issues <IID>`/`mrs <IID>`
- plan-expose-discussion-ids.feedback-3.md: replace `show` with
  "detail views"
- work-item-status-graphql.md: update example commands from
  `lore show issue 123` to `lore issues 123`

docs/plan-expose-discussion-ids.md

@@ -43,7 +43,7 @@ construct API calls without a separate project-ID lookup, even after path change
 **Back-compat rule**: Note payloads in the `notes` list command continue exposing `gitlab_id`
 for existing consumers, but **MUST also** expose `gitlab_note_id` with the same value. This
 ensures agents can use a single field name (`gitlab_note_id`) across all commands — `notes`,
-`show`, and `discussions --include-notes` — without special-casing by command.
+`issues <IID>`/`mrs <IID>`, and `discussions --include-notes` — without special-casing by command.
 
 This contract exists so agents can deterministically construct `glab api` write calls without
 cross-referencing multiple commands. Each workstream below must satisfy these fields in its