feat: install logging, error trapping, PXE/ISO integration tests

Kickstart installs on real hardware failed silently — no error reporting,
only 3 progress callbacks, zero log streaming. This overhaul makes every
install fully observable.

Kickstart improvements:
- Error trapping in %pre and %post (trap ERR sends failure details to bastion)
- 12+ granular progress stages (was 3): SSH, hostname, k3s prep, EFI boot, metadata
- Background log streamer: tails %post output and batch-sends to /api/log
- bastion_log() function for explicit log lines from kickstart scripts

Bastion API:
- POST /api/log — receives raw log lines from kickstart (single or batch)
- InstallLogBuffer — per-MAC ring buffer (2000 lines) + file persistence
- GET /api/logs/:mac — now returns log_lines + log_total alongside stages
- SSE /api/logs/:mac/follow — uses named events (event: stage vs event: log)
- Progress events forwarded to labd via bastion-progress WebSocket message
- Post-provision k3s logs routed through progressBus (was console-only)

dnsmasq fixes found during VM testing:
- HTTP Boot filename: ipxe-real.efi → ipxe.efi (leftover from old 2-stage approach)
- pxe-service directives: only in proxy mode (breaks OVMF PXE in full mode)
- PXEClient vendor class echo for UEFI firmware compatibility

Integration tests:
- PXE boot test: blank UEFI VM → dnsmasq → HTTP Boot → iPXE → bastion → install
- ISO boot test: blank VM boots from bastion-generated ISO → same flow
- Shared helpers: pxe-network (no DHCP, nftables fix), pxe-vm (UEFI + ISO boot)
- test-provision.sh: runs both PXE + ISO tests with prerequisite checks
- 250GB sparse QCOW2 disk (LVM layout needs ~204GB)

201 unit tests passing (11 new).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bastion/deploy/k3s/deployment.yaml

@@ -7,6 +7,8 @@ metadata:
     app: bastion
 spec:
   replicas: 1
+  strategy:
+    type: Recreate
   selector:
     matchLabels:
       app: bastion
@@ -15,10 +17,18 @@ spec:
       labels:
         app: bastion
     spec:
+      imagePullSecrets:
+        - name: gitea-registry
       hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
+      dnsConfig:
+        options:
+          - name: ndots
+            value: "1"
       containers:
         - name: bastion
-          image: mysources.co.uk/michal/lab-bastion:latest
+          image: mysources.co.uk/michal/lab/bastion:latest
+          imagePullPolicy: Always
           command:
             - node
             - src/cli/dist/index.js
@@ -26,9 +36,16 @@ spec:
             - bastion
             - standalone
             - start
+            - --foreground
           envFrom:
             - configMapRef:
                 name: bastion-config
+          env:
+            - name: BASTION_JOIN_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: bastion-join-token
+                  key: token
           ports:
             - containerPort: 8080
               name: http
@@ -43,17 +60,21 @@ spec:
               add:
                 - NET_ADMIN
                 - NET_RAW
+          startupProbe:
+            httpGet:
+              path: /api/machines
+              port: 8080
+            failureThreshold: 60
+            periodSeconds: 10
           livenessProbe:
             httpGet:
               path: /api/machines
               port: 8080
-            initialDelaySeconds: 15
             periodSeconds: 30
           readinessProbe:
             httpGet:
               path: /api/machines
               port: 8080
-            initialDelaySeconds: 5
             periodSeconds: 10
       volumes:
         - name: state