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

locales/ga.yaml

@@ -391,7 +391,7 @@ Future messages in this room will use that transcript until `/reset` or another
     not_git_repo:            "✗ Ní stór git é seo — ní féidir nuashonrú."
     hermes_cmd_not_found:    "✗ Níorbh fhéidir an t-ordú `hermes` a aimsiú. Tá Hermes ag rith, ach níorbh fhéidir leis an ordú nuashonraithe an inrite a aimsiú ar PATH ná tríd an léirmhínitheoir Python reatha. Bain triail as `hermes update` a rith de láimh i do theirminéal."
     start_failed:            "✗ Theip ar nuashonrú a thosú: {error}"
-    starting:                "⚕ Ag tosú nuashonrú Hermes… Cuirfidh mé an dul chun cinn ar shruth anseo."
+    starting:                "☤ Ag tosú nuashonrú Hermes… Cuirfidh mé an dul chun cinn ar shruth anseo."
 
   usage:
     rate_limits:              "⏱️ **Teorainneacha Ráta:** {state}"