refactor: parametrize pipeline cu --course flag + suport Vimeo/text

Un singur set de scripturi acum rulează pe orice curs configurat în
courses.py. Master rămâne la rădăcina repo (backward-compat M1-M6);
cursuri noi (ex. practitioner la shop.cursnlp.ro) primesc un root
dedicat (nlp-practitioner/) cu propriile artefacte.

- courses.py: config dict (master, practitioner) + course_paths() +
  validate_manifest_course() (manifest fără course_key = master).
- download.py: --course + --modules; trei tipuri de lecții (audio HTTP,
  Vimeo iframe via yt-dlp audio-only, text-only cu captură HTML);
  merge cu manifest existent în loc de replace; strip [Audio] pentru
  backward-compat paths.
- transcribe.py: --course + --modules; skip type==text; path-uri prin
  course_paths(); validare course_key.
- summarize.py: --course + --compile; template prompt folosește
  course['name']; scrie SUPORT_CURS.md cu LF explicit (WSL2 baseline).
- md_to_pdf.py: --course resolv-ă summaries_dir / pdf_dir per curs.
- run.bat: detectează master|practitioner ca primul argument,
  propagă --course la sub-scripturi; backward-compat run.bat [modules].
- requirements.txt: + yt-dlp.
- .gitignore: nlp-practitioner/audio/, audio_wav/, scratch_recon.py, tmp_recon/.
- tests/test_regression.sh: 5 gate-uri read-only (import, schema,
  disk-coherence, SUPORT_CURS byte-identic, cross-course isolation).

Regression curs master: PASS (manifest + SUPORT_CURS.md hash
identic cu baseline /tmp/suport_before.md).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

run.bat

@@ -2,9 +2,27 @@
 setlocal enabledelayedexpansion
 cd /d "%~dp0"
 
+:: ============================================================
+:: Course + module filter argument parsing
+:: Usage:
+::   run.bat                    -> master, all modules (backward-compat)
+::   run.bat 1-3                -> master, modules 1-3 (backward-compat)
+::   run.bat practitioner       -> practitioner, all modules
+::   run.bat practitioner 1-3   -> practitioner, modules 1-3
+:: ============================================================
+set "COURSE_KEY=master"
+set "MODULE_FILTER=%~1"
+if /i "%~1"=="master" (
+    set "COURSE_KEY=master"
+    set "MODULE_FILTER=%~2"
+)
+if /i "%~1"=="practitioner" (
+    set "COURSE_KEY=practitioner"
+    set "MODULE_FILTER=%~2"
+)
 
 echo ============================================================
-echo  NLP Master - Download + Transcribe Pipeline
+echo  NLP Course Pipeline  (course: %COURSE_KEY%)
 echo ============================================================
 echo.
 
@@ -46,20 +64,28 @@ if not defined PYTHON_CMD (
 )
 
 :: --- .env credentials ---
+:: Each course uses its own env var pair. Check based on selected course.
+if /i "%COURSE_KEY%"=="practitioner" (
+    set "ENV_USER=PRACTITIONER_USERNAME"
+    set "ENV_PASS=PRACTITIONER_PASSWORD"
+) else (
+    set "ENV_USER=COURSE_USERNAME"
+    set "ENV_PASS=COURSE_PASSWORD"
+)
 if exist ".env" (
-    findstr /m "COURSE_USERNAME=." ".env" >nul 2>&1
+    findstr /m "!ENV_USER!=." ".env" >nul 2>&1
     if errorlevel 1 (
-        echo [X] .env           File exists but COURSE_USERNAME is empty
-        echo     Edit .env and fill in your credentials.
+        echo [X] .env           File exists but !ENV_USER! is empty
+        echo     Edit .env and set !ENV_USER! and !ENV_PASS!.
         set "PREREQ_OK="
     ) else (
-        echo [OK] .env           Credentials configured
+        echo [OK] .env           Credentials configured for %COURSE_KEY%
     )
 ) else (
     echo [X] .env           NOT FOUND
     echo     Create .env with:
-    echo       COURSE_USERNAME=your_email
-    echo       COURSE_PASSWORD=your_password
+    echo       !ENV_USER!=your_email
+    echo       !ENV_PASS!=your_password
     set "PREREQ_OK="
 )
 
@@ -265,11 +291,11 @@ echo      Done.
 echo.
 echo [3/4] Downloading audio files...
 echo ============================================================
-if "%~1"=="" (
-    .venv\Scripts\python download.py
+if "!MODULE_FILTER!"=="" (
+    .venv\Scripts\python download.py --course %COURSE_KEY%
 ) else (
-    echo Modules filter: %~1
-    .venv\Scripts\python download.py --modules %~1
+    echo Modules filter: !MODULE_FILTER!
+    .venv\Scripts\python download.py --course %COURSE_KEY% --modules !MODULE_FILTER!
 )
 if errorlevel 1 (
     echo.
@@ -287,11 +313,11 @@ echo Using: %WHISPER_BIN%
 echo Model: %WHISPER_MODEL%
 echo.
 
-if "%~1"=="" (
-    .venv\Scripts\python transcribe.py
+if "!MODULE_FILTER!"=="" (
+    .venv\Scripts\python transcribe.py --course %COURSE_KEY%
 ) else (
-    echo Modules filter: %~1
-    .venv\Scripts\python transcribe.py --modules %~1
+    echo Modules filter: !MODULE_FILTER!
+    .venv\Scripts\python transcribe.py --course %COURSE_KEY% --modules !MODULE_FILTER!
 )
 if errorlevel 1 (
     echo.