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/src/shared/tests/protocol.test.ts

@@ -0,0 +1,109 @@
+// Tests for WebSocket protocol types, type guards, and parsing.
+
+import { describe, it, expect } from "vitest";
+import {
+  isAgentMessage,
+  isServerMessage,
+  parseAgentMessage,
+  parseServerMessage,
+  generateRequestId,
+} from "../src/protocol/index.js";
+
+describe("protocol type guards", () => {
+  it("isAgentMessage accepts valid heartbeat", () => {
+    expect(
+      isAgentMessage({
+        type: "heartbeat",
+        hostname: "worker-1",
+        uptime: 100,
+        version: "0.1.0",
+        memUsage: 1024,
+        cpuUsage: 0.5,
+      }),
+    ).toBe(true);
+  });
+
+  it("isAgentMessage accepts valid exec-exit", () => {
+    expect(
+      isAgentMessage({ type: "exec-exit", requestId: "abc", exitCode: 0 }),
+    ).toBe(true);
+  });
+
+  it("isAgentMessage rejects unknown type", () => {
+    expect(isAgentMessage({ type: "unknown-type" })).toBe(false);
+  });
+
+  it("isAgentMessage rejects non-object", () => {
+    expect(isAgentMessage("heartbeat")).toBe(false);
+    expect(isAgentMessage(null)).toBe(false);
+    expect(isAgentMessage(42)).toBe(false);
+  });
+
+  it("isServerMessage accepts valid exec", () => {
+    expect(
+      isServerMessage({
+        type: "exec",
+        requestId: "abc",
+        command: "ls",
+        args: ["-la"],
+        timeout: 30000,
+        tty: false,
+      }),
+    ).toBe(true);
+  });
+
+  it("isServerMessage accepts server-shutdown", () => {
+    expect(
+      isServerMessage({ type: "server-shutdown", reconnectAfter: 5000 }),
+    ).toBe(true);
+  });
+
+  it("isServerMessage rejects agent message types", () => {
+    expect(isServerMessage({ type: "heartbeat" })).toBe(false);
+  });
+});
+
+describe("parseAgentMessage", () => {
+  it("parses valid JSON", () => {
+    const msg = parseAgentMessage(
+      JSON.stringify({ type: "heartbeat", hostname: "w1", uptime: 1, version: "0.1.0", memUsage: 0, cpuUsage: 0 }),
+    );
+    expect(msg.type).toBe("heartbeat");
+  });
+
+  it("throws on invalid JSON", () => {
+    expect(() => parseAgentMessage("not json")).toThrow();
+  });
+
+  it("throws on invalid message type", () => {
+    expect(() => parseAgentMessage(JSON.stringify({ type: "bogus" }))).toThrow(
+      "Invalid agent message",
+    );
+  });
+});
+
+describe("parseServerMessage", () => {
+  it("parses valid JSON", () => {
+    const msg = parseServerMessage(
+      JSON.stringify({ type: "heartbeat-ack", serverTime: "2026-01-01T00:00:00Z" }),
+    );
+    expect(msg.type).toBe("heartbeat-ack");
+  });
+
+  it("throws on agent message type", () => {
+    expect(() =>
+      parseServerMessage(JSON.stringify({ type: "heartbeat" })),
+    ).toThrow("Invalid server message");
+  });
+});
+
+describe("generateRequestId", () => {
+  it("returns a string", () => {
+    expect(typeof generateRequestId()).toBe("string");
+  });
+
+  it("returns unique IDs", () => {
+    const ids = new Set(Array.from({ length: 100 }, () => generateRequestId()));
+    expect(ids.size).toBe(100);
+  });
+});