CI - IMPROVEMENT - Log the Julia change-detection verdict to the job log

The detector wrote its decision only to the run summary, so the job log showed
the script and nothing else. That makes "why did the suite run?" unanswerable
from the place people look first. Echo the verdict and the matched files to
stdout as well, and list the files considered when the suite is skipped.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019tFBCa5iBXyb7xp8LxqBJx

Author: Claude

.github/workflows/test.yaml

@@ -41,10 +41,14 @@ jobs:
         run: |
           set -euo pipefail
 
+          # Report the decision to the job log as well as the run summary, so
+          # `why did/didn't this run?` is answerable from either one.
+          say() { echo "$1"; echo "$1" >> "$GITHUB_STEP_SUMMARY"; }
+
           # Pushes to main/develop always run: every merged commit gets verified.
           if [ "${{ github.event_name }}" != "pull_request" ]; then
             echo "julia=true" >> "$GITHUB_OUTPUT"
-            echo "Not a pull request — running the full test suite." >> "$GITHUB_STEP_SUMMARY"
+            say "Not a pull request — running the full test suite."
             exit 0
           fi
 
@@ -58,18 +62,21 @@ jobs:
 
           relevant=$(printf '%s\n' "$files" | grep -Ev "$not_tested" | grep -E "$tested" || true)
 
-          {
-            echo "### Julia change detection"
-            echo
-            if [ -n "$relevant" ]; then
-              echo "Running the test suite. Matched files:"
-              echo '```'
-              echo "$relevant"
-              echo '```'
-            else
-              echo "No Julia code, test data or example decks changed — skipping the test suite."
-            fi
-          } >> "$GITHUB_STEP_SUMMARY"
+          say "### Julia change detection"
+          say ""
+          if [ -n "$relevant" ]; then
+            say "Running the test suite. Matched files:"
+            say '```'
+            say "$relevant"
+            say '```'
+          else
+            say "No Julia code, test data or example decks changed — skipping the test suite."
+            say ""
+            say "Files considered:"
+            say '```'
+            say "$files"
+            say '```'
+          fi
 
           if [ -n "$relevant" ]; then
             echo "julia=true" >> "$GITHUB_OUTPUT"