BINKY-WP-0006: close with three clean railiance mail cycles

Host LLM_CONNECT_URL discovery uses ClusterIP when DNS is unreachable;
mail path fails hard if triage fails. Mark T06 done and workplan finished;
update residual docs (OperatingRhythm, cutover runbook, llm-rhythm).

scripts/railiance-rhythm/run-mail.sh

@@ -17,14 +17,14 @@ log "mail-scan rc=${scan_rc}"
 if [[ "${scan_rc}" -ne 0 ]]; then
   exit "${scan_rc}"
 fi
-# Triage must use llm-connect (OpenRouter), not a host coding agent.
-# Until agent-harness mail-triage exists (BINKY-WP-0006), scan-only is OK.
-if agent-harness mail-triage --help >/dev/null 2>&1; then
-  log "START mail-triage (llm-connect)"
-  agent-harness mail-triage \
-    --target-repo "${BINKY_REPO}" \
-    2>&1 | tee -a "${LOG_DIR}/mail.log" || log "WARN: mail-triage failed"
-else
-  log "SKIP mail-triage: command not available yet (BINKY-WP-0006); scan-only"
+# Triage uses llm-connect (OpenRouter), never a host coding agent.
+log "START mail-triage (llm-connect)"
+agent-harness mail-triage \
+  --target-repo "${BINKY_REPO}" \
+  2>&1 | tee -a "${LOG_DIR}/mail.log"
+triage_rc=${PIPESTATUS[0]}
+log "mail-triage rc=${triage_rc}"
+if [[ "${triage_rc}" -ne 0 ]]; then
+  exit "${triage_rc}"
 fi
 log "END mail-intake"