homelab v0.8.0: browser verbs for headful anti-bot web automation

Add `homelab browser run|open` so agents can drive the cluster's headful
Chrome (chrome-service) over CDP from the devvm. The headless playwright/mcp
browser can load anti-bot sites and fill their forms, but the gated submit
silently fails — e.g. the Stirling Ackroyd Fixflo tenant portal returned
net::ERR_FILE_NOT_FOUND on its pre-submit check and hung, creating nothing.
Driving the real headful Chrome submits first try. That capability already
existed but was undiscoverable, so it cost ~40 min + redundant form re-runs to
find; now it is one command, versioned, test-covered, and `browser --help`
carries the when-to-use signature + an error-code cheat-sheet so the right tool
is reached at the right moment (the failure was judgment, not setup).

- port-forward svc/chrome-service:9222 (tunnels API-server->pod, so it bypasses
  the :9222 NetworkPolicy), assert non-headless via /json/version,
  connect_over_cdp, inject the same vendored stealth.js the in-cluster callers
  use; the port-forward is always torn down, on success and on error.
- node CDP client pinned to playwright-core@1.48.2 to match the v1.48.0-noble
  image (Chromium 130); self-provisioned lazily into ~/.cache/homelab, no
  per-user setup.
- default is a fresh incognito context (safe for the shared browser + concurrent
  callers); --shared-context reuses the warmed persistent profile.
- TDD: cmd_browser_test.go covers arg parsing, headless detection, the version
  pin, the help cheat-sheet, and a stealth.js drift guard. Verified end-to-end
  against bot.sannysoft.com (real Chrome UA, webdriver hidden, plugins/WebGL
  spoofed) and `browser open`.
- docs: README v0.8 section, ADR-0013, and a chrome-service.md "driving from
  outside the cluster" section.

Closes: code-nepg

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cli/cmd_browser_test.go

@@ -0,0 +1,160 @@
+package main
+
+import (
+	"os"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestParseBrowserArgsRun(t *testing.T) {
+	got, err := parseBrowserArgs("run", []string{
+		"flow.js", "--url", "https://example.com", "--shared-context",
+		"--port", "19999", "--timeout", "45", "--keep-open",
+	})
+	if err != nil {
+		t.Fatalf("parseBrowserArgs run: unexpected err: %v", err)
+	}
+	want := browserOpts{
+		mode: "run", script: "flow.js", url: "https://example.com",
+		sharedCtx: true, keepOpen: true, port: 19999, timeout: 45,
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("parseBrowserArgs run =\n %+v\nwant\n %+v", got, want)
+	}
+}
+
+func TestParseBrowserArgsRunDefaults(t *testing.T) {
+	got, err := parseBrowserArgs("run", []string{"flow.js"})
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if got.script != "flow.js" || got.sharedCtx || got.keepOpen || got.port != 0 {
+		t.Fatalf("defaults wrong: %+v", got)
+	}
+	if got.timeout != defaultBrowserTimeout {
+		t.Fatalf("timeout default = %d, want %d", got.timeout, defaultBrowserTimeout)
+	}
+}
+
+func TestParseBrowserArgsRunRequiresScript(t *testing.T) {
+	if _, err := parseBrowserArgs("run", []string{"--url", "https://x"}); err == nil {
+		t.Fatalf("run without a script path should error")
+	}
+}
+
+func TestParseBrowserArgsOpenRequiresURL(t *testing.T) {
+	got, err := parseBrowserArgs("open", []string{"https://example.com"})
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if got.url != "https://example.com" || got.mode != "open" {
+		t.Fatalf("open parse wrong: %+v", got)
+	}
+	if _, err := parseBrowserArgs("open", []string{}); err == nil {
+		t.Fatalf("open without a URL should error")
+	}
+}
+
+func TestParseBrowserArgsHelp(t *testing.T) {
+	for _, a := range [][]string{{"--help"}, {"-h"}, {"flow.js", "--help"}} {
+		got, err := parseBrowserArgs("run", a)
+		if err != nil {
+			t.Fatalf("help parse %v: %v", a, err)
+		}
+		if !got.help {
+			t.Fatalf("args %v should set help", a)
+		}
+	}
+}
+
+func TestParseBrowserArgsEqualsForm(t *testing.T) {
+	got, err := parseBrowserArgs("run", []string{"flow.js", "--url=https://x", "--port=8123", "--timeout=10"})
+	if err != nil {
+		t.Fatalf("unexpected err: %v", err)
+	}
+	if got.url != "https://x" || got.port != 8123 || got.timeout != 10 {
+		t.Fatalf("--flag=value form not parsed: %+v", got)
+	}
+}
+
+func TestCDPHealthy(t *testing.T) {
+	real := []byte(`{"Browser":"Chrome/130.0.6723.31","User-Agent":"Mozilla/5.0 (X11; Linux x86_64) Chrome/130.0.0.0 Safari/537.36","webSocketDebuggerUrl":"ws://127.0.0.1/devtools/browser/x"}`)
+	browser, ok, err := cdpHealthy(real)
+	if err != nil || !ok {
+		t.Fatalf("real Chrome should be healthy: ok=%v err=%v", ok, err)
+	}
+	if !strings.HasPrefix(browser, "Chrome/") {
+		t.Fatalf("browser = %q, want Chrome/ prefix", browser)
+	}
+
+	headless := []byte(`{"Browser":"HeadlessChrome/130.0.6723.31","User-Agent":"Mozilla/5.0 HeadlessChrome/130.0.0.0"}`)
+	if _, ok, _ := cdpHealthy(headless); ok {
+		t.Fatalf("HeadlessChrome must be reported unhealthy (the whole point of chrome-service)")
+	}
+
+	if _, _, err := cdpHealthy([]byte("not json")); err == nil {
+		t.Fatalf("malformed /json/version body should error")
+	}
+}
+
+func TestBuildPortForwardArgs(t *testing.T) {
+	got := buildPortForwardArgs(18080)
+	want := []string{"-n", "chrome-service", "port-forward", "svc/chrome-service", "18080:9222"}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("buildPortForwardArgs =\n %v\nwant\n %v", got, want)
+	}
+}
+
+func TestBrowserClientPackageJSONPinsVersion(t *testing.T) {
+	pj := browserClientPackageJSON()
+	if !strings.Contains(pj, `"playwright-core": "`+playwrightVersion+`"`) {
+		t.Fatalf("package.json must pin playwright-core to %s; got:\n%s", playwrightVersion, pj)
+	}
+}
+
+func TestPlaywrightVersionPinnedToServerMinor(t *testing.T) {
+	// chrome-service runs mcr.microsoft.com/playwright:v1.48.0-noble; the CDP
+	// client minor MUST match (protocol changes between minors).
+	if !strings.HasPrefix(playwrightVersion, "1.48.") {
+		t.Fatalf("playwrightVersion = %q, must be 1.48.x to match the chrome-service image", playwrightVersion)
+	}
+}
+
+func TestBrowserHelpHasDiagnosticCheatSheet(t *testing.T) {
+	h := browserHelp()
+	for _, want := range []string{
+		"homelab browser run",
+		"ERR_FILE_NOT_FOUND",
+		"ERR_CONNECTION_REFUSED",
+		"network panel",
+		"headless",
+		"--shared-context",
+	} {
+		if !strings.Contains(h, want) {
+			t.Errorf("browser --help is missing %q (the discoverability/self-correction payload)", want)
+		}
+	}
+}
+
+func TestStealthJSEmbeddedMatchesCanonical(t *testing.T) {
+	// The embedded copy must never drift from the source of truth that the
+	// in-cluster callers use, else the CLI's stealth and the cluster's diverge.
+	canonical, err := os.ReadFile("../stacks/chrome-service/files/stealth.js")
+	if err != nil {
+		t.Fatalf("read canonical stealth.js: %v", err)
+	}
+	if stealthJS != string(canonical) {
+		t.Fatalf("cli/browser_stealth.js has drifted from stacks/chrome-service/files/stealth.js — re-copy it")
+	}
+}
+
+func TestFreePortReturnsUsablePort(t *testing.T) {
+	p, err := freePort()
+	if err != nil {
+		t.Fatalf("freePort: %v", err)
+	}
+	if p <= 1024 || p > 65535 {
+		t.Fatalf("freePort returned %d, want an ephemeral port", p)
+	}
+}