Name this board's completion column Implementation Complete

The status token stays ready_to_merge, which is the harness's word and
not the board's: the harness knows which of three moments the work has
reached and this copy decides what that names in this tracker. Only the
option this deployment writes changes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01U1HiUf7CrMjZMj32TySdiH

Author: jerodw

.harness/scripts/github.sh

@@ -350,7 +350,7 @@ CATEGORY_LABEL_COLOR="ededed"
 # than an edit to the logic above it.
 PLANNED_OPTION="${L5_ITEM_PLANNED_OPTION:-Planned}"
 IN_PROGRESS_OPTION="${L5_ITEM_IN_PROGRESS_OPTION:-In Progress}"
-READY_TO_MERGE_OPTION="${L5_ITEM_READY_TO_MERGE_OPTION:-Ready to Merge}"
+READY_TO_MERGE_OPTION="${L5_ITEM_READY_TO_MERGE_OPTION:-Implementation Complete}"
 
 # --- what only the query job uses. Edit these. ---------------------------
 # How many items one search may return. The harness bounds what it will