fix: preserve final newline when writing wiki pages (#274)

* Initial plan

* fix: use printf '%s\n' to preserve final newline in wiki pages

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>
Co-authored-by: Russell Horton <mrjf@github.com>

Author: Copilot

workflows/agentic-wiki-writer.md

@@ -70,7 +70,7 @@ safe-outputs:
             jq -r '.items[] | select(.type == "push_wiki") | .files | fromjson | to_entries[] | @base64' "$GH_AW_AGENT_OUTPUT" | while IFS= read -r entry; do
               FILENAME=$(printf '%s' "$entry" | base64 -d | jq -r '.key')
               CONTENT=$(printf '%s' "$entry" | base64 -d | jq -r '.value')
-              printf '%s' "$CONTENT" > "$FILENAME"
+              printf '%s\n' "$CONTENT" > "$FILENAME"
             done
         - name: Commit and push
           run: |