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`

plans/work-item-status-graphql.md

@@ -107,12 +107,12 @@ Each criterion is independently testable. Implementation is complete when ALL pa
 
 ### AC-7: Show Issue Display (E2E)
 
-**Human (`lore show issue 123`):**
+**Human (`lore issues 123`):**
 - [ ] New line after "State": `Status:   In progress` (colored by `status_color` hex → nearest terminal color)
 - [ ] Status line only shown when `status_name IS NOT NULL`
 - [ ] Category shown in parens when available, lowercased: `Status:   In progress (in_progress)`
 
-**Robot (`lore --robot show issue 123`):**
+**Robot (`lore --robot issues 123`):**
 - [ ] JSON includes `status_name`, `status_category`, `status_color`, `status_icon_name`, `status_synced_at` fields
 - [ ] Fields are `null` (not absent) when status not available
 - [ ] `status_synced_at` is integer (ms epoch UTC) or `null` — enables freshness checks by consumers