feat: LLM auto-fallback + codegen pack + OCR pack

LLM auto-fallback (jarvis-app/src/app.rs + jarvis-core/src/config.rs):
- When neither intent classifier nor levenshtein finds a command match,
  route the utterance straight to the LLM instead of just playing the
  "not found" sound. Triggers ("скажи X", "answer Y") still work and
  take precedence — they short-circuit before command lookup.
- Two new config knobs:
    LLM_AUTO_FALLBACK = true        — master toggle
    LLM_AUTO_FALLBACK_MIN_CHARS = 4 — suppress for very short utterances
                                       so background noise doesn't burn
                                       Groq quota
- Requires GROQ_TOKEN; if absent, behaviour is unchanged (play_not_found).

codegen/ command pack:
- Phrases: "напиши код X", "сгенерируй скрипт Y", "write code Z", etc.
- Strips the trigger from the recognized phrase, sends what remains to
  Groq with a strict system prompt ("return ONLY code, no fences, no
  commentary") at temperature 0.2.
- Parses the JSON content, unescapes \n / \" / \\ / \t, strips any
  remaining ```lang ... ``` fences, drops the result into the clipboard
  via jarvis.system.clipboard.set.
- Notifies a 120-char preview + plays ok-sound. Works for any language
  the model handles (Python by default if unspecified).
- GROQ_TOKEN / GROQ_MODEL / GROQ_BASE_URL read from env at call time —
  same envvars the voice-loop fallback already uses.

ocr/ command pack:
- Phrases: "прочитай экран", "что на экране", "read screen", etc.
- Captures the primary screen via System.Windows.Forms + System.Drawing
  to a temp PNG, then shells to tesseract.exe (-l rus+eng for ru/ua,
  -l eng for en).
- Resolves Tesseract by PATH first, then C:\Program Files\Tesseract-OCR
  and the x86 install dir; if none works the user gets a friendly
  "winget install UB-Mannheim.TesseractOCR" hint in a notification.
- Recognized text goes to clipboard + a 200-char preview notification.

All three features are portable (env-var resolution, no hardcoded user
paths). Command-pack total is now 11. cargo test -p jarvis-core --lib
commands::tests passes 3/3.

crates/jarvis-app/src/app.rs

@@ -459,12 +459,21 @@ fn execute_command(text: &str, rt: &tokio::runtime::Runtime) -> bool {
         }
     } else {
         info!("No command found for: {}", text);
-        voices::play_not_found();
-        ipc::send(IpcEvent::Error { 
-            message: format!("Command not found: {}", text) 
-        });
+
+        if jarvis_core::config::LLM_AUTO_FALLBACK
+            && crate::llm_fallback::is_enabled()
+            && text.chars().count() >= jarvis_core::config::LLM_AUTO_FALLBACK_MIN_CHARS
+        {
+            info!("Auto-routing to LLM (no command match): {}", text);
+            crate::llm_fallback::handle(text);
+        } else {
+            voices::play_not_found();
+            ipc::send(IpcEvent::Error {
+                message: format!("Command not found: {}", text)
+            });
+        }
     }
-    
+
     ipc::send(IpcEvent::Idle);
     false // no chain on error or not found
 }

crates/jarvis-core/src/config.rs

@@ -197,6 +197,13 @@ pub const CMS_WAIT_DELAY: std::time::Duration = std::time::Duration::from_secs(1
 pub const LLM_DEFAULT_ENABLED: bool = true;
 pub const LLM_DEFAULT_MAX_HISTORY: usize = 8;
 pub const LLM_DEFAULT_MAX_TOKENS: u32 = 256;
+
+// Auto-route unrecognized commands to the LLM (no "скажи" trigger required).
+// Triggers still work and take precedence — this only kicks in when neither
+// the intent classifier nor the levenshtein fallback found a command match.
+pub const LLM_AUTO_FALLBACK: bool = true;
+// Don't auto-fallback for very short utterances — too noisy.
+pub const LLM_AUTO_FALLBACK_MIN_CHARS: usize = 4;
 pub const LLM_SYSTEM_PROMPT_RU: &str = "Ты — J.A.R.V.I.S. (Just A Rather Very Intelligent System), \
 ИИ-ассистент Тони Старка из киновселенной Marvel (до событий Age of Ultron — ты НЕ Vision и НЕ FRIDAY). \
 Ведёшь себя как британский дворецкий: вежливо, иронично, с лёгким сарказмом, обращаешься к пользователю «сэр». \

resources/commands/codegen/codegen.lua

@@ -0,0 +1,99 @@
+local lang = jarvis.context.language
+local phrase = (jarvis.context.phrase or ""):lower()
+
+local triggers = {
+    "сгенерируй скрипт", "напиши скрипт", "сделай скрипт",
+    "сгенерируй код", "набросай код", "напиши код",
+    "generate code", "write code", "make script", "write script",
+    "згенеруй код", "напиши код", "зроби скрипт",
+}
+
+local request = phrase
+for _, t in ipairs(triggers) do
+    local s, e = string.find(request, t, 1, true)
+    if s == 1 then
+        request = request:sub(e + 1)
+        break
+    end
+end
+request = request:gsub("^%s+", ""):gsub("%s+$", "")
+
+if request == "" then
+    jarvis.system.notify(
+        lang == "ru" and "Codegen" or "Codegen",
+        lang == "ru" and "Что писать?" or "What to write?"
+    )
+    jarvis.audio.play_error()
+    return { chain = false }
+end
+
+local token = jarvis.system.env("GROQ_TOKEN")
+if not token or token == "" then
+    jarvis.log("error", "GROQ_TOKEN not set")
+    jarvis.system.notify("Codegen", "GROQ_TOKEN не задан")
+    jarvis.audio.play_error()
+    return { chain = false }
+end
+
+local base = jarvis.system.env("GROQ_BASE_URL")
+if not base or base == "" then base = "https://api.groq.com/openai/v1" end
+
+local model = jarvis.system.env("GROQ_MODEL")
+if not model or model == "" then model = "llama-3.3-70b-versatile" end
+
+local system_prompt = lang == "ru"
+    and "Ты Senior Engineer. На запрос пользователя верни ТОЛЬКО исходный код, без обрамления ``` и без объяснений. Если язык не задан — выбери самый подходящий (по умолчанию Python). Не добавляй комментарии-болтовню."
+    or "You are a Senior Engineer. Reply with ONLY source code, no ``` fences, no commentary. Pick the most fitting language if unspecified (Python by default). Skip chatty comments."
+
+jarvis.log("info", "codegen request: " .. request)
+
+local payload = {
+    model = model,
+    messages = {
+        { role = "system", content = system_prompt },
+        { role = "user",   content = request },
+    },
+    max_tokens = 1024,
+    temperature = 0.2,
+}
+
+local headers = { Authorization = "Bearer " .. token }
+local res = jarvis.http.post_json(base .. "/chat/completions", payload, headers)
+
+if not res.ok then
+    jarvis.log("error", "codegen API failed: status=" .. tostring(res.status) .. " body=" .. tostring(res.body):sub(1, 200))
+    jarvis.system.notify("Codegen", "Ошибка API: " .. tostring(res.status))
+    jarvis.audio.play_error()
+    return { chain = false }
+end
+
+local body = res.body or ""
+local content = body:match('"content"%s*:%s*"(.-[^\\])"')
+if not content then
+    jarvis.log("error", "codegen: could not parse content from " .. body:sub(1, 200))
+    jarvis.system.notify("Codegen", "Не смог распарсить ответ")
+    jarvis.audio.play_error()
+    return { chain = false }
+end
+
+content = content:gsub('\\n', '\n')
+content = content:gsub('\\"', '"')
+content = content:gsub('\\\\', '\\')
+content = content:gsub('\\t', '\t')
+
+content = content:gsub("^```[%w]*\n?", "")
+content = content:gsub("\n?```%s*$", "")
+content = content:gsub("^%s+", ""):gsub("%s+$", "")
+
+jarvis.system.clipboard.set(content)
+jarvis.log("info", "codegen result copied to clipboard (" .. #content .. " bytes)")
+
+local preview = content:sub(1, 120)
+if #content > 120 then preview = preview .. "..." end
+jarvis.system.notify(
+    lang == "ru" and "Код в буфере" or "Code in clipboard",
+    preview
+)
+jarvis.audio.play_ok()
+
+return { chain = false }

resources/commands/codegen/command.toml

@@ -0,0 +1,27 @@
+[[commands]]
+id = "codegen_clipboard"
+type = "lua"
+script = "codegen.lua"
+sandbox = "full"
+timeout = 30000
+
+[commands.phrases]
+ru = [
+    "напиши код",
+    "сгенерируй код",
+    "набросай код",
+    "сделай скрипт",
+    "напиши скрипт",
+    "сгенерируй скрипт",
+]
+en = [
+    "write code",
+    "generate code",
+    "make script",
+    "write script",
+]
+ua = [
+    "напиши код",
+    "згенеруй код",
+    "зроби скрипт",
+]

resources/commands/ocr/command.toml

@@ -0,0 +1,26 @@
+[[commands]]
+id = "read_screen"
+type = "lua"
+script = "read_screen.lua"
+sandbox = "full"
+timeout = 30000
+
+[commands.phrases]
+ru = [
+    "прочитай экран",
+    "что на экране",
+    "распознай текст с экрана",
+    "что написано на экране",
+    "сними текст с экрана",
+]
+en = [
+    "read screen",
+    "what is on screen",
+    "ocr screen",
+    "extract text from screen",
+]
+ua = [
+    "прочитай екран",
+    "що на екрані",
+    "розпізнай текст з екрана",
+]

resources/commands/ocr/read_screen.lua

@@ -0,0 +1,82 @@
+local lang = jarvis.context.language
+
+local temp = jarvis.system.env("TEMP") or jarvis.system.env("TMP") or "C:\\Windows\\Temp"
+local ts = jarvis.context.time.year .. jarvis.context.time.month .. jarvis.context.time.day
+    .. "_" .. jarvis.context.time.hour .. jarvis.context.time.minute .. jarvis.context.time.second
+local img = temp .. "\\jarvis_ocr_" .. ts .. ".png"
+
+local capture_ps = string.format(
+    [[Add-Type -AssemblyName System.Windows.Forms,System.Drawing; $b=[System.Windows.Forms.Screen]::PrimaryScreen.Bounds; $bmp=New-Object Drawing.Bitmap $b.Width,$b.Height; $g=[Drawing.Graphics]::FromImage($bmp); $g.CopyFromScreen($b.Location,[Drawing.Point]::Empty,$b.Size); $bmp.Save('%s'); $g.Dispose(); $bmp.Dispose()]],
+    img:gsub("\\", "\\\\")
+)
+local capture_cmd = string.format('powershell -NoProfile -ExecutionPolicy Bypass -Command "%s"', capture_ps:gsub('"', '\\"'))
+local cap = jarvis.system.exec(capture_cmd)
+
+if not cap.success or not jarvis.fs.exists(img) then
+    jarvis.log("error", "screen capture failed: " .. tostring(cap.stderr))
+    jarvis.system.notify("OCR", lang == "ru" and "Не смог снять экран" or "Could not capture screen")
+    jarvis.audio.play_error()
+    return { chain = false }
+end
+
+local tesseract_paths = {
+    "tesseract.exe",
+    "C:\\Program Files\\Tesseract-OCR\\tesseract.exe",
+    "C:\\Program Files (x86)\\Tesseract-OCR\\tesseract.exe",
+}
+
+local tess = nil
+for _, p in ipairs(tesseract_paths) do
+    local check
+    if p == "tesseract.exe" then
+        check = jarvis.system.exec("where tesseract.exe")
+    else
+        check = { success = jarvis.fs.exists(p), stdout = p }
+    end
+    if check.success and (check.stdout or ""):gsub("[\r\n]+$", "") ~= "" then
+        tess = p == "tesseract.exe" and "tesseract.exe" or '"' .. p .. '"'
+        break
+    end
+end
+
+if not tess then
+    jarvis.log("error", "tesseract not found")
+    jarvis.system.notify(
+        "OCR",
+        lang == "ru"
+            and "Tesseract не установлен. Установи: winget install UB-Mannheim.TesseractOCR"
+            or "Tesseract not installed. Install: winget install UB-Mannheim.TesseractOCR"
+    )
+    jarvis.audio.play_error()
+    return { chain = false }
+end
+
+local langs = lang == "en" and "eng" or "rus+eng"
+local ocr_cmd = string.format('%s "%s" - -l %s', tess, img, langs)
+local ocr = jarvis.system.exec(ocr_cmd)
+
+if not ocr.success then
+    jarvis.log("error", "tesseract failed: " .. tostring(ocr.stderr):sub(1, 200))
+    jarvis.system.notify("OCR", lang == "ru" and "Tesseract упал" or "Tesseract failed")
+    jarvis.audio.play_error()
+    return { chain = false }
+end
+
+local text = (ocr.stdout or ""):gsub("^%s+", ""):gsub("%s+$", "")
+if text == "" then
+    jarvis.system.notify("OCR", lang == "ru" and "Текста не найдено" or "No text found")
+    jarvis.audio.play_not_found()
+    return { chain = false }
+end
+
+jarvis.system.clipboard.set(text)
+jarvis.log("info", "OCR result (" .. #text .. " bytes) copied to clipboard")
+
+local preview = text:gsub("\r?\n", " "):sub(1, 200)
+if #text > 200 then preview = preview .. "..." end
+jarvis.system.notify(
+    lang == "ru" and "Текст с экрана" or "Screen text",
+    preview
+)
+jarvis.audio.play_ok()
+return { chain = false }