Forbid parenthetical glosses in LLM replies

The model was appending English literal-translation annotations (e.g.
"On walli e jam? (Lit: Did you sleep in peace?)") which then got read
aloud by TTS as gibberish. Two-layer fix:

1. System prompt now explicitly bans "(Lit: ...)", "(meaning ...)",
and any English/French parenthetical aside, and demands 100%
target-language output.
2. Defensive client-side regex strips any "(Lit/Literal/Meaning/
Translation/English/French ...)" parenthetical the model emits
anyway before returning the string to TTS.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/llm/minimal_client.py

@@ -101,7 +101,11 @@ def _build_system_prompt(
         "translate what they said back to them.",
         "",
         "Output format: plain natural text only. No JSON, no code fences, no "
-        "markdown, no translations, no romanisation, no explanations. Reply in "
+        "markdown, no translations, no romanisation, no explanations, and "
+        "ABSOLUTELY no parenthetical glosses, literal translations, or "
+        "English/French annotations of any kind (do NOT write things like "
+        "'(Lit: ...)', '(meaning ...)', or any '(English ...)' aside). The "
+        f"output must be 100% {full} characters and punctuation only. Reply in "
         "1–3 short sentences suitable to be read aloud by a text-to-speech voice.",
     ]
 
@@ -216,6 +220,18 @@ class MinimalClient:
                     first, rest = raw.split("\n", 1)
                     if len(first) < 20 and " " not in first:
                         raw = rest.strip()
+            # Defensive: strip parenthetical English/French glosses the model
+            # sometimes appends despite the prompt — e.g. "Foo bar (Lit: ...)".
+            # We only strip parentheticals that LOOK like glosses (start with
+            # Lit/Literal/Meaning/Translation/English/French, or contain ≥3
+            # consecutive ASCII letters that aren't part of the target script).
+            import re as _re
+            raw = _re.sub(
+                r"\s*\((?:lit\.?|literal(?:ly)?|meaning|translation|english|french|fr|en)[^)]*\)",
+                "",
+                raw,
+                flags=_re.IGNORECASE,
+            ).strip()
             return raw
         except Exception as exc:  # pragma: no cover — surfaced to UI
             logger.error("MinimalClient error: %s", exc)