fix: humanize pref namespace + async headless cloak

humanize: the wrapper wrote invisible_playwright.humanize[.maxTime], but the
binary's Juggler reads stealthfox.humanize (PageHandler.js gates the Bezier
mouse path on it). The old name was a dead no-op, so humanize never fired and
every mouse.move teleported the cursor — an automation tell. Renamed across
config.py, launcher.py and async_api.py; the mouse test now asserts the on/off
contrast instead of a false-green moves>=1.

headless (async): InvisiblePlaywright(headless=True) crashed on Windows/macOS.
_resolve_headless called make_virtual_display().start() unconditionally, but on
Win/macOS that returns None (the binary self-cloaks via DWMWA_CLOAK; only Linux
spawns Xvfb), so it died with AttributeError. It also never injected
cloak_prefs(), so the window wouldn't have hidden anyway. Mirror the sync
launcher: guard `if vd is not None` + inject cloak_prefs() when headless on
win32/darwin. Verified on FF150: headless=True loads, exits clean, window fully
hidden (no MainWindowHandle / no taskbar entry).

tests/test_mouse.py

@@ -132,12 +132,9 @@ def test_mouse_move_outside_viewport_does_not_raise(firefox_binary):
 # ────────────────────────────────────────────────────────────────────
 
 
-@pytest.mark.e2e
-def test_humanize_emits_intermediate_moves(firefox_binary):
-    """A long mouse.move from one corner to another should fire several
-    mousemove events on the page when the humanize hook is enabled (which
-    is the StealthFox default)."""
-    with InvisiblePlaywright(seed=42, binary_path=firefox_binary) as browser:
+def _humanize_move_count(firefox_binary, humanize):
+    """Count page mousemove events fired by ONE long mouse.move."""
+    with InvisiblePlaywright(seed=42, binary_path=firefox_binary, humanize=humanize) as browser:
         page = browser.new_page()
         page.goto(_data_url(
             "<div id=d style='width:600px;height:400px' "
@@ -146,8 +143,27 @@ def test_humanize_emits_intermediate_moves(firefox_binary):
         page.mouse.move(10, 10)
         page.evaluate("window.__n = 0")
         page.mouse.move(500, 300)
-        moves = page.evaluate("window.__n")
-        assert moves >= 1, f"expected at least 1 mousemove event, got {moves}"
+        return page.evaluate("window.__n")
+
+
+@pytest.mark.e2e
+def test_humanize_emits_intermediate_moves(firefox_binary):
+    """A long mouse.move must expand into MANY intermediate mousemove events when
+    humanize is on (Bezier), and ~1 (a teleport) when off. We assert the on/off
+    CONTRAST: `moves >= 1` alone was a false-green — a teleport already fires 1 —
+    and that false-green hid a pref-namespace bug (wrapper wrote
+    `invisible_playwright.humanize`, the binary's Juggler reads `stealthfox.humanize`)
+    that left humanize silently dead in production. This test now fails if the
+    pref ever stops reaching the binary."""
+    on = _humanize_move_count(firefox_binary, True)
+    off = _humanize_move_count(firefox_binary, False)
+    assert off <= 2, f"humanize OFF should ~teleport (<=2 moves), got {off}"
+    assert on >= 4, (
+        f"humanize ON must expand into many intermediate moves (Bezier); got {on} "
+        f"(off={off}). moves==1 means the cursor teleports — the exact automation "
+        f"tell humanize exists to remove, and a sign the stealthfox.* pref isn't "
+        f"reaching the binary's Juggler."
+    )
 
 
 # ────────────────────────────────────────────────────────────────────

tests/unit/test_config_public.py

@@ -29,8 +29,8 @@ def test_get_default_stealth_prefs_random_seed_returns_dict():
     assert isinstance(prefs, dict)
     assert len(prefs) > 0
     # humanize toggle is always set explicitly
-    assert "invisible_playwright.humanize" in prefs
-    assert prefs["invisible_playwright.humanize"] is True
+    assert "stealthfox.humanize" in prefs
+    assert prefs["stealthfox.humanize"] is True
 
 
 def test_get_default_stealth_prefs_seed_is_deterministic():
@@ -50,22 +50,22 @@ def test_get_default_stealth_prefs_different_seeds_differ():
 def test_humanize_false_disables_prefs():
     """humanize=False removes the maxTime knob and flips the toggle to False."""
     prefs = get_default_stealth_prefs(seed=42, humanize=False)
-    assert prefs["invisible_playwright.humanize"] is False
-    assert "invisible_playwright.humanize.maxTime" not in prefs
+    assert prefs["stealthfox.humanize"] is False
+    assert "stealthfox.humanize.maxTime" not in prefs
 
 
 def test_humanize_default_sets_max_time_1_5():
     """humanize=True -> default maxTime is 1.5s, stored as string."""
     prefs = get_default_stealth_prefs(seed=42, humanize=True)
-    assert prefs["invisible_playwright.humanize"] is True
-    assert prefs["invisible_playwright.humanize.maxTime"] == "1.5"
+    assert prefs["stealthfox.humanize"] is True
+    assert prefs["stealthfox.humanize.maxTime"] == "1.5"
 
 
 def test_humanize_float_overrides_max_time():
     """Float for humanize is the explicit cap in seconds."""
     prefs = get_default_stealth_prefs(seed=42, humanize=3.0)
-    assert prefs["invisible_playwright.humanize"] is True
-    assert prefs["invisible_playwright.humanize.maxTime"] == "3.0"
+    assert prefs["stealthfox.humanize"] is True
+    assert prefs["stealthfox.humanize.maxTime"] == "3.0"
 
 
 def test_extra_prefs_overlay_takes_precedence():