fix: address multiple bugs from code review

- teardown_all.sh: replace `yes |` pipeline with `< <(yes)` process
  substitution to avoid SIGPIPE (exit 141) false failures under pipefail
- phase6_teardown.sh: extract push mirror `.id` instead of `.remote_name`
  to match the DELETE /push_mirrors/{id} API contract
- phase5_migrate_pipelines.sh: expand sed regex from `[a-z_]*` to
  `[a-z_.]*` to handle nested GitHub contexts like
  `github.event.pull_request.number`
- lib/common.sh: render_template now requires explicit variable list to
  prevent envsubst from eating Nginx variables ($host, $proxy_add_...)
- backup scripts: remove MacBook relay, use direct Unraid↔Fedora SCP;
  fix dump path to write to /data/ (mounted volume) instead of /tmp/
  (container-only); add unzip -t integrity verification
- preflight.sh: add --skip-port-checks flag for resuming with
  --start-from (ports already bound by earlier phases)
- run_all.sh: update run_step to pass extra args; use --skip-port-checks
  when --start-from > 1
- post-checks (phase4/7/9): wrap API calls in helper functions with
  >/dev/null redirection instead of passing -o /dev/null as API data
- phase8: replace GitHub archiving with [MIRROR] description marking
  and disable wiki/projects/Pages (archived repos reject push mirrors)
- restore_to_primary.sh: add require_vars for Fedora SSH variables

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backup/restore_to_primary.sh

@@ -65,7 +65,7 @@ fi
 # ---------------------------------------------------------------------------
 # Step 1: Transfer archive to Unraid /tmp if needed
 # If the archive is a local file, SCP it directly. If it's on Fedora,
-# we relay through the local machine.
+# SCP directly from Fedora to Unraid (no MacBook relay).
 # ---------------------------------------------------------------------------
 log_step 1 "Preparing archive..."
 ARCHIVE_NAME=$(basename "$ARCHIVE_PATH")
@@ -76,16 +76,13 @@ if [[ -f "$ARCHIVE_PATH" ]]; then
   log_info "Uploading local archive to Unraid..."
   scp_to UNRAID "$ARCHIVE_PATH" "$UNRAID_ARCHIVE"
 else
-  # Assume path is on Fedora — relay through local machine
+  # Assume path is on Fedora — SCP directly from Fedora to Unraid
+  require_vars FEDORA_IP FEDORA_SSH_USER UNRAID_IP UNRAID_SSH_USER
   log_info "Transferring archive from Fedora to Unraid..."
-  LOCAL_TMP=$(mktemp -d)
-  # SCP from Fedora to local
-  ip="${FEDORA_IP:-}" user="${FEDORA_SSH_USER:-}" port="${FEDORA_SSH_PORT:-22}"
-  scp -o ConnectTimeout=10 -o BatchMode=yes -P "$port" \
-    "${user}@${ip}:${ARCHIVE_PATH}" "${LOCAL_TMP}/${ARCHIVE_NAME}"
-  # SCP from local to Unraid
-  scp_to UNRAID "${LOCAL_TMP}/${ARCHIVE_NAME}" "$UNRAID_ARCHIVE"
-  rm -rf "$LOCAL_TMP"
+  UNRAID_PORT="${UNRAID_SSH_PORT:-22}"
+  ssh_exec FEDORA "scp -o ConnectTimeout=10 -o StrictHostKeyChecking=accept-new \
+    -o BatchMode=yes -P '${UNRAID_PORT}' \
+    '${ARCHIVE_PATH}' '${UNRAID_SSH_USER}@${UNRAID_IP}:${UNRAID_ARCHIVE}'"
 fi
 log_success "Archive ready on Unraid: ${UNRAID_ARCHIVE}"