feat(tower): routines staging push and delta

Add compute_delta_named, routines_staging_files, compute_routines_delta
so routines.json goes last in the push delta. Generalize push_file with
subdir param (default podcasts, compat preserved). Fix test_delta.py:
compute_delta lives in lisael_content, not lisael_server.

tower/lisael_content.py

@@ -385,9 +385,26 @@ def compute_delta(staging, have):
         files.append("manifest.json")
     return files
 
-def push_file(ip, name):
-    data = open(os.path.join(STAGING, name), "rb").read()
-    url = f"http://{ip}:{BOX_PORT}/put?name=podcasts/{name}"
+def compute_delta_named(staging, have, manifest_name):
+    haveset = set(have)
+    files = [f for f in staging if f != manifest_name and f not in haveset]
+    if files and manifest_name in staging:
+        files.append(manifest_name)
+    return files
+
+def routines_staging_files():
+    if not os.path.isdir(STAGING_ROUTINES):
+        return []
+    return sorted(f for f in os.listdir(STAGING_ROUTINES)
+                  if not f.startswith(".") and f != ".cache.json")
+
+def compute_routines_delta(have):
+    return compute_delta_named(routines_staging_files(), have, "routines.json")
+
+def push_file(ip, name, subdir="podcasts"):
+    src_dir = STAGING_ROUTINES if subdir == "routines" else STAGING
+    data = open(os.path.join(src_dir, name), "rb").read()
+    url = f"http://{ip}:{BOX_PORT}/put?name={subdir}/{name}"
     with urllib.request.urlopen(urllib.request.Request(url, data=data, method="POST"),
                                 timeout=300) as r:
         return r.status

tower/test_delta.py

@@ -1,4 +1,4 @@
-from lisael_server import compute_delta
+from lisael_content import compute_delta
 
 def test_delta():
     stg = ["oli_01.m4a", "oli.bin", "bestioles_01.mp3", "manifest.json"]

tower/test_routines.py

@@ -139,6 +139,50 @@ def test_build_routine_manifest_regen_on_emoji_change():
     if os.path.exists(C.ROUTINES_JSON):
         os.remove(C.ROUTINES_JSON)
 
+def test_routines_delta_manifest_last():
+    os.makedirs(C.STAGING_ROUTINES, exist_ok=True)
+    for f in ("matin.bin", "matin_01.bin", "matin_01.mp3", "routines.json"):
+        open(os.path.join(C.STAGING_ROUTINES, f), "wb").close()
+    d = C.compute_routines_delta([])
+    assert d[-1] == "routines.json"            # manifest always last
+    assert set(d[:-1]) == {"matin.bin", "matin_01.bin", "matin_01.mp3"}
+    # box already has assets -> only manifest moves if assets changed; here all present
+    assert C.compute_routines_delta(["matin.bin", "matin_01.bin", "matin_01.mp3"]) == []
+
+
+def test_push_file_url_construction():
+    """push_file builds the correct URL with subdir in the path."""
+    captured = {}
+    class FakeResp:
+        status = 200
+        def __enter__(self): return self
+        def __exit__(self, *a): pass
+
+    def fake_urlopen(req, timeout=None):
+        captured["url"] = req.full_url
+        return FakeResp()
+
+    orig = C.urllib.request.urlopen
+    try:
+        C.urllib.request.urlopen = fake_urlopen
+        # Create dummy files in each staging dir
+        os.makedirs(C.STAGING, exist_ok=True)
+        os.makedirs(C.STAGING_ROUTINES, exist_ok=True)
+        open(os.path.join(C.STAGING, "test.mp3"), "wb").close()
+        open(os.path.join(C.STAGING_ROUTINES, "routines.json"), "wb").close()
+        # default subdir = podcasts
+        C.push_file("127.0.0.1", "test.mp3")
+        assert "podcasts/test.mp3" in captured["url"]
+        # explicit routines subdir
+        C.push_file("127.0.0.1", "routines.json", subdir="routines")
+        assert "routines/routines.json" in captured["url"]
+        # explicit podcasts subdir same as default
+        C.push_file("127.0.0.1", "test.mp3", subdir="podcasts")
+        assert "podcasts/test.mp3" in captured["url"]
+    finally:
+        C.urllib.request.urlopen = orig
+
+
 if __name__ == "__main__":
     for name, fn in sorted(globals().items()):
         if name.startswith("test_"):