feat(identity): rename user-visible identity to voculinux with one-time legacy import

The fork takes its own name everywhere a user can see it: binaries
(voculinux, voculinux-gui), desktop entry, autostart, tray, D-Bus
namespace (com.voculinux.Voculinux, no alias for the old name),
config/data/cache dirs, single-instance lock, IBus engine identity,
tray icons, resource prefixes, VOCULINUX_* environment names, and the
update-checker user agent. The internal Python module stays vocalinux
and the distribution metadata keeps the upstream URLs as provenance.

On first run a previous Vocalinux install's config.json, custom
dictionary, and portal restore token are copied once into the new
locations (new config always wins, no merge, no write-back); models
re-resolve through the pinned-checksum download path. An offline
naming-sweep test proves no old-name strings remain on user-visible
surfaces outside the allowlist.

Refs #18

tests/test_app_identity.py

@@ -7,7 +7,7 @@ Seams under test (per spec Testing Decisions):
   the rename ticket must flip (or deliberately keep) without network access.
 
 No user-visible behaviour, name, path, or string changes: all asserted values
-are the pre-rename Vocalinux/vocalinux literals.
+are the pre-rename Voculinux/voculinux literals.
 """
 
 import ast
@@ -26,27 +26,27 @@ def _load_identity():
 def test_central_values_are_current_names():
     """Shared definition still carries the pre-rename literals."""
     identity = _load_identity()
-    assert identity.APP_NAME == "Vocalinux"
-    assert identity.APP_ID == "vocalinux"
-    assert identity.APP_DIR_NAME == "vocalinux"
-    assert identity.CLI_PROG == "vocalinux"
-    assert identity.BUS_NAME == "com.vocalinux.Vocalinux"
-    assert identity.OBJECT_PATH == "/com/vocalinux/Vocalinux"
-    assert identity.INTERFACE_NAME == "com.vocalinux.Vocalinux"
-    assert identity.DESKTOP_FILENAME == "vocalinux.desktop"
-    assert identity.DESKTOP_ICON_NAME == "vocalinux"
-    assert identity.ENGINE_NAME == "vocalinux"
-    assert identity.ENGINE_LONGNAME == "Vocalinux"
-    assert identity.COMPONENT_NAME == "org.freedesktop.IBus.Vocalinux"
-    assert identity.IBUS_DIR_NAME == "vocalinux-ibus"
-    assert identity.UPDATE_CHECKER_USER_AGENT == "Vocalinux-UpdateChecker"
-    assert identity.RESOURCE_DIR_NAME == "vocalinux"
-    assert identity.VERIFICATION_STAMP_NAME == ".vocalinux_verified"
-    assert identity.LOG_FILE_PREFIX == "vocalinux_logs_"
-    assert identity.PORTAL_TOKEN_PREFIX == "vocalinux_"
-    assert identity.ENV_FORCE_BACKEND == "VOCALINUX_FORCE_BACKEND"
-    assert identity.ENV_INJECT_MODIFIER_WAIT == "VOCALINUX_INJECT_MODIFIER_WAIT"
-    assert identity.ENV_YDOTOOL_KEY_DELAY == "VOCALINUX_YDOTOOL_KEY_DELAY"
+    assert identity.APP_NAME == "Voculinux"
+    assert identity.APP_ID == "voculinux"
+    assert identity.APP_DIR_NAME == "voculinux"
+    assert identity.CLI_PROG == "voculinux"
+    assert identity.BUS_NAME == "com.voculinux.Voculinux"
+    assert identity.OBJECT_PATH == "/com/voculinux/Voculinux"
+    assert identity.INTERFACE_NAME == "com.voculinux.Voculinux"
+    assert identity.DESKTOP_FILENAME == "voculinux.desktop"
+    assert identity.DESKTOP_ICON_NAME == "voculinux"
+    assert identity.ENGINE_NAME == "voculinux"
+    assert identity.ENGINE_LONGNAME == "Voculinux"
+    assert identity.COMPONENT_NAME == "org.freedesktop.IBus.Voculinux"
+    assert identity.IBUS_DIR_NAME == "voculinux-ibus"
+    assert identity.UPDATE_CHECKER_USER_AGENT == "Voculinux-UpdateChecker"
+    assert identity.RESOURCE_DIR_NAME == "voculinux"
+    assert identity.VERIFICATION_STAMP_NAME == ".voculinux_verified"
+    assert identity.LOG_FILE_PREFIX == "voculinux_logs_"
+    assert identity.PORTAL_TOKEN_PREFIX == "voculinux_"
+    assert identity.ENV_FORCE_BACKEND == "VOCULINUX_FORCE_BACKEND"
+    assert identity.ENV_INJECT_MODIFIER_WAIT == "VOCULINUX_INJECT_MODIFIER_WAIT"
+    assert identity.ENV_YDOTOOL_KEY_DELAY == "VOCULINUX_YDOTOOL_KEY_DELAY"
 
 
 def _imports_app_identity(path: Path) -> bool:
@@ -108,13 +108,13 @@ def test_source_pinned_literals_reserved_for_rename():
     """
     about = (SRC_ROOT / "ui" / "settings_about.py").read_text(encoding="utf-8")
     for literal in (
-        'VOCALINUX_SITE_URL = "https://vocalinux.com"',
-        'title="Vocalinux"',
-        'get_icon_path("vocalinux")',
+        'VOCULINUX_SITE_URL = "https://voculinux.com"',
+        'title="Voculinux"',
+        'get_icon_path("voculinux")',
     ):
         assert literal in about, literal
     pad = (SRC_ROOT / "ui" / "dictation_pad.py").read_text(encoding="utf-8")
-    assert 'window.set_title("Vocalinux Dictation Pad")' in pad
+    assert 'window.set_title("Voculinux Dictation Pad")' in pad
 
 
 def test_rename_inventory_files_exist():
@@ -134,3 +134,18 @@ def test_retained_inventory_records_internal_names():
     import vocalinux
 
     assert vocalinux.__name__ == "vocalinux"
+
+
+def test_legacy_names_recorded_and_unclaimed():
+    """The old install identity is recorded for the one-time import only.
+
+    No compatibility alias: the legacy D-Bus name differs from the claimed
+    one, and no source claims it.
+    """
+    identity = _load_identity()
+    assert identity.LEGACY_APP_DIR_NAME == "vocalinux"
+    assert identity.LEGACY_APP_DIR_NAME != identity.APP_DIR_NAME
+    assert identity.LEGACY_BUS_NAME == "com.vocalinux.Vocalinux"
+    assert identity.LEGACY_BUS_NAME != identity.BUS_NAME
+    service = (SRC_ROOT / "dbus_service.py").read_text(encoding="utf-8")
+    assert identity.LEGACY_BUS_NAME not in service