feat(tower): twemoji to RGB565A8 bin helper

Add emoji_cp() (pure: emoji → Twemoji codepoint, strips VS16) and
emoji_bin() (download Twemoji, resize 160×160 RGBA, LVGLImage.py →
RGB565A8 .bin in STAGING_ROUTINES). TDD test passes (test_routines.py).

tower/lisael_content.py

@@ -8,12 +8,14 @@ from PIL import Image
 
 BASE       = os.environ.get("LISAEL_BASE", "/home/clems/lisael-content")
 STAGING    = os.environ.get("LISAEL_STAGING", os.path.join(BASE, "podcasts"))
+STAGING_ROUTINES = os.environ.get("LISAEL_STAGING_ROUTINES", os.path.join(BASE, "routines"))
 LVGLIMG    = os.environ.get("LISAEL_LVGLIMG", os.path.join(BASE, "LVGLImage.py"))
 FEEDS_JSON = os.path.join(BASE, "feeds.json")
 BOX_JSON   = os.path.join(BASE, "box-state.json")
 BOX_PORT   = int(os.environ.get("LISAEL_BOX_PORT", "8080"))
 TTS_URL    = os.environ.get("LISAEL_TTS_URL", "http://100.78.6.122:9300/v1/audio/speech")
 TTS_VOICE  = os.environ.get("LISAEL_TTS_VOICE", "fr")
+TWEMOJI    = os.environ.get("LISAEL_TWEMOJI", "https://raw.githubusercontent.com/jdecked/twemoji/main/assets/72x72")
 UA  = {"User-Agent": "Mozilla/5.0"}
 NS  = {"itunes": "http://www.itunes.com/dtds/podcast-1.0.dtd"}
 SUBS = {"’": "'", "“": '"', "”": '"', "–": "-",
@@ -116,6 +118,32 @@ def tts_speak(text):
     with urllib.request.urlopen(req, timeout=30) as r:
         return r.read()
 
+def emoji_cp(emoji):
+    """Twemoji filename codepoints, VS16 (U+FE0F) stripped or twemoji 404s."""
+    return "-".join(f"{ord(c):x}" for c in emoji if c != "️")
+
+def emoji_bin(emoji, key):
+    """Download the Twemoji for `emoji`, resize 160x160 RGBA, write `<key>.bin`
+    (RGB565A8, keeps alpha) into STAGING_ROUTINES. Returns '<key>.bin' or ''."""
+    try:
+        url = f"{TWEMOJI}/{emoji_cp(emoji)}.png"
+        raw = urllib.request.urlopen(
+            urllib.request.Request(url, headers={"User-Agent": "curl/8"}),
+            timeout=15, context=ssl.create_default_context()).read()
+        im = Image.open(io.BytesIO(raw)).convert("RGBA").resize((160, 160), Image.LANCZOS)
+        os.makedirs(STAGING_ROUTINES, exist_ok=True)
+        with tempfile.TemporaryDirectory() as td:
+            png = os.path.join(td, f"{key}.png"); im.save(png)
+            subprocess.run([sys.executable, LVGLIMG, "--ofmt", "BIN", "--cf", "RGB565A8",
+                            "-o", td, png], check=True, capture_output=True)
+            binp = os.path.join(td, f"{key}.bin")
+            if os.path.exists(binp):
+                os.replace(binp, os.path.join(STAGING_ROUTINES, f"{key}.bin"))
+                return f"{key}.bin"
+    except Exception as e:
+        print("emoji_bin fail", key, emoji, e, flush=True)
+    return ""
+
 def make_cover(img_bytes, key):
     """160x160 RGB565 .bin into STAGING via LVGLImage. Returns '<key>.bin' or ''."""
     try:

tower/test_routines.py

@@ -0,0 +1,19 @@
+import os, tempfile
+os.environ["LISAEL_BASE"] = tempfile.mkdtemp(prefix="routines_test_")
+os.environ["LISAEL_STAGING"] = os.path.join(os.environ["LISAEL_BASE"], "podcasts")
+os.environ["LISAEL_STAGING_ROUTINES"] = os.path.join(os.environ["LISAEL_BASE"], "routines")
+import lisael_content as C
+
+def test_emoji_cp_strips_vs16():
+    # plain emoji: single codepoint
+    assert C.emoji_cp("\U0001F600") == "1f600"           # 😀
+    # emoji with VS16 (U+FE0F) must be stripped (twemoji 404s otherwise)
+    assert C.emoji_cp("☀️") == "2600"          # ☀️ -> 2600
+    # multi-codepoint (no VS16): joined by '-'
+    assert C.emoji_cp("\U0001F468‍\U0001F4BB").split("-")[0] == "1f468"
+
+if __name__ == "__main__":
+    for name, fn in sorted(globals().items()):
+        if name.startswith("test_"):
+            fn(); print("ok", name)
+    print("ALL OK")