fix(ship): trim the T4 root-cause line so ship fits its parity cap beside #3372 (#3158)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

scripts/resolvers/preamble/generate-test-failure-triage.ts

@@ -55,7 +55,7 @@ Ask with AskUserQuestion in the AskUserQuestion Format. List each failure the sa
 ### Step T4: Execute the chosen action
 
 **If "Investigate and fix now":**
-- One read-only pass for the root cause; if unclear, invoke \`/investigate\` first.
+- One read-only root-cause pass, then \`/investigate\` if unclear.
 - Fix the pre-existing failure.
 - Commit the fix separately from the branch's changes: \`git commit -m "fix: pre-existing test failure in <test-file>"\`
 - Continue with the workflow.