fix(branding): use the Caduceus ☤ (U+2624), not the Rod of Asclepius ⚕ (U+2625)

Every inline glyph — CLI banner/status bar/response labels/goodbye, setup
and doctor boxes, gateway update prompts, WhatsApp reply prefix, TUI theme,
locale strings and the docs — used ⚕, the staff of Asclepius (medicine).
Hermes carries the Caduceus ☤. The ASCII-art logo was already correct.

Mechanical swap across 60 files (no logic change); both glyphs are
East-Asian-width Neutral so no layout shifts. Skins that set their own
`response_label` / `goodbye` are unaffected.

Direction from PR #7064 (@bixycler), the earliest of #7064 / #9611 / #15574,
redone against current main.

Fixes #9565

cli.py

@@ -2297,7 +2297,7 @@ def _build_compact_banner() -> str:
     dim_color = _color("banner_dim", "#B8860B")
 
     if (getattr(_skin, "name", "default") if _skin else "default") == "default":
-        tiny_line = "⚕ NOUS HERMES"
+        tiny_line = "☤ NOUS HERMES"
     else:
         tiny_line = _skin.get_branding("agent_name", "Hermes Agent") if _skin else "Hermes Agent"
     line1 = f"{tiny_line} - AI Agent Framework"