fix(tts): sanitise text before SAPI so it stops reading "J.A.R.V.I.S." as "J точка A точка R точка..."

User complaint: SAPI reads every dotted acronym character-by-character with a
"точка" between letters. Unbearable on every speak. No real TTS analog
shipping yet (Silero/Coqui/Inworld in roadmap), so the immediate fix is text
preprocessing.

New module `jarvis-core::text_utils` with `sanitize_for_speech()`:
- Specific brand mapping: J.A.R.V.I.S. → Джарвис, U.S.A. → США, U.K. →
  Британия, U.S. → США, S.O.S. → сос.
- Generic dotted-acronym collapse: any `[letter].[letter].[letter].(...)`
  run of 3+ letters gets its dots stripped. "T.O.N." → "TON".
- URL stripping: anything starting with http/https gets replaced with the
  word "ссылка". SAPI reading URLs char-by-char is unlistenable.
- Em/en-dash normalisation: — → -, « » " stripped.
- Whitespace collapse.

Wired in two places:
- `jarvis.speak(text, opts?)` Lua API runs sanitiser unless opts.raw=true.
- `jarvis-app/llm_fallback::speak_via_sapi` runs sanitiser before the SAPI
  PowerShell shell-out for LLM auto-fallback replies.

5 unit tests in `text_utils::tests` covering jarvis-name collapse, generic
acronym pattern, URL stripping, dash normalisation, and "leave clean
russian sentences alone" — all green.

Real TTS upgrade (Silero v4 first cut) tracked as P0.1 in roadmap.

crates/jarvis-core/src/text_utils.rs

@@ -0,0 +1,149 @@
+// Public text helpers used by both the Lua tts API (`jarvis.speak`) and the
+// jarvis-app llm_fallback server-side TTS path. Kept here (not under `lua::api`)
+// so jarvis-app can depend on it without touching the lua sandbox internals.
+
+// Rewrite text so SAPI doesn't read every punctuation mark literally:
+//   "J.A.R.V.I.S." → "Джарвис"
+//   "T.O.N." / "U.S.A." → letters joined ("ТОН", "USA")
+//   "https://google.com/foo?bar=1" → "ссылка"
+//   "—" / "–" → "-"
+//   collapses repeated whitespace, strips ASCII / Russian quotes.
+// Without this SAPI says "J ТОЧКА A ТОЧКА R ТОЧКА ..." which is unlistenable.
+pub fn sanitize_for_speech(text: &str) -> String {
+    let mut t = text.to_string();
+
+    // Specific brand/product names first (caught before generic acronym rule).
+    let replacements = [
+        ("J.A.R.V.I.S.", "Джарвис"),
+        ("J.A.R.V.I.S",  "Джарвис"),
+        ("U.S.A.", "США"),
+        ("U.K.",   "Британия"),
+        ("U.S.",   "США"),
+        ("S.O.S.", "сос"),
+    ];
+    for (from, to) in replacements {
+        t = t.replace(from, to);
+    }
+
+    // Collapse generic dotted acronyms like "T.O.N." → "TON" (3+ letters,
+    // any alphabet) so SAPI reads the run as a single token instead of
+    // each letter-plus-точка.
+    t = collapse_dotted_acronyms(&t);
+
+    // Strip URLs. SAPI reads them character-by-character at ~50 words per
+    // minute; almost always the user wants a confirmation, not the URL.
+    t = strip_urls(&t);
+
+    // Soft punctuation cleanup.
+    t = t
+        .replace('—', " - ")
+        .replace('–', " - ")
+        .replace('«', "")
+        .replace('»', "")
+        .replace('"', "");
+
+    while t.contains("  ") {
+        t = t.replace("  ", " ");
+    }
+
+    t.trim().to_string()
+}
+
+fn collapse_dotted_acronyms(s: &str) -> String {
+    let chars: Vec<char> = s.chars().collect();
+    let mut out: Vec<char> = Vec::with_capacity(chars.len());
+    let mut i = 0;
+
+    while i < chars.len() {
+        let mut j = i;
+        let mut letters: Vec<char> = Vec::new();
+        loop {
+            if j >= chars.len() { break; }
+            if !chars[j].is_alphabetic() { break; }
+            if j + 1 >= chars.len() || chars[j + 1] != '.' { break; }
+            letters.push(chars[j]);
+            j += 2;
+        }
+        if letters.len() >= 3 {
+            out.extend(letters.iter());
+            i = j;
+        } else {
+            out.push(chars[i]);
+            i += 1;
+        }
+    }
+    out.into_iter().collect()
+}
+
+fn strip_urls(s: &str) -> String {
+    let mut out = String::with_capacity(s.len());
+    let mut chars = s.chars().peekable();
+    let mut url_buf = String::new();
+    let mut in_url = false;
+
+    while let Some(c) = chars.next() {
+        if !in_url {
+            if (c == 'h' || c == 'H')
+                && chars.clone().take(4).collect::<String>().to_lowercase().starts_with("ttp")
+            {
+                in_url = true;
+                url_buf.clear();
+                url_buf.push(c);
+                continue;
+            }
+            out.push(c);
+        } else if c.is_whitespace() || c == ',' || c == ';' {
+            if url_buf.len() > 7 {
+                out.push_str("ссылка");
+            } else {
+                out.push_str(&url_buf);
+            }
+            out.push(c);
+            url_buf.clear();
+            in_url = false;
+        } else {
+            url_buf.push(c);
+        }
+    }
+    if in_url {
+        if url_buf.len() > 7 {
+            out.push_str("ссылка");
+        } else {
+            out.push_str(&url_buf);
+        }
+    }
+    out
+}
+
+#[cfg(test)]
+mod tests {
+    use super::sanitize_for_speech;
+
+    #[test]
+    fn jarvis_dotted_acronym() {
+        assert_eq!(sanitize_for_speech("Привет от J.A.R.V.I.S."), "Привет от Джарвис");
+    }
+
+    #[test]
+    fn generic_acronym_collapse() {
+        assert_eq!(sanitize_for_speech("Курс T.O.N. растёт"), "Курс TON растёт");
+    }
+
+    #[test]
+    fn url_replaced() {
+        let out = sanitize_for_speech("Открой https://www.google.com/search?q=x пожалуйста");
+        assert!(out.contains("ссылка"));
+        assert!(!out.contains("google.com"));
+    }
+
+    #[test]
+    fn dashes_normalised() {
+        assert_eq!(sanitize_for_speech("Тони — гений"), "Тони - гений");
+    }
+
+    #[test]
+    fn passes_clean_russian_unchanged() {
+        let s = "Привет, как дела сегодня";
+        assert_eq!(sanitize_for_speech(s), s);
+    }
+}