Initial commit — TANINUX (camel): management app + distro packaging

- app: GTK System Settings (tsettings) + Software Hub (thub) + TUI
- distro/: camel.toml manifest + MANIFEST.md (Arch + [tanin] repo model)
- packaging/: taninux, tanin-desktop (niri metapackage), tanin-greet,
  tanin-libadwaita, tanin-setup
- docs/, data/, LICENSE (GPL-3.0-or-later)

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

packaging/tanin-greet/dev/mockgreetd.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+# Minimal greetd IPC mock — just enough for tanin-greet to render and dry-run a
+# login WITHOUT real auth. greetd framing: native-endian u32 length + JSON.
+# Usage:  python3 mockgreetd.py /tmp/mock-greetd.sock
+import json, os, socket, struct, sys
+
+SOCK = sys.argv[1] if len(sys.argv) > 1 else "/tmp/mock-greetd.sock"
+try:
+    os.unlink(SOCK)
+except FileNotFoundError:
+    pass
+
+srv = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+srv.bind(SOCK)
+srv.listen(8)
+print(f"mock greetd listening on {SOCK}", flush=True)
+
+
+def recv(conn):
+    hdr = conn.recv(4)
+    if len(hdr) < 4:
+        return None
+    n = struct.unpack("=I", hdr)[0]
+    buf = b""
+    while len(buf) < n:
+        chunk = conn.recv(n - len(buf))
+        if not chunk:
+            break
+        buf += chunk
+    return json.loads(buf)
+
+
+def send(conn, obj):
+    data = json.dumps(obj).encode()
+    conn.sendall(struct.pack("=I", len(data)) + data)
+
+
+while True:
+    conn, _ = srv.accept()
+    try:
+        while True:
+            req = recv(conn)
+            if req is None:
+                break
+            if req.get("type") == "create_session":
+                send(conn, {"type": "auth_message",
+                            "auth_message_type": "secret",
+                            "auth_message": "Password:"})
+            else:  # post_auth_message_response / start_session / cancel_session
+                send(conn, {"type": "success"})
+    except Exception as e:  # noqa: BLE001
+        print("conn error:", e, flush=True)
+    finally:
+        conn.close()