build: drop the local Python release method, return to CI-only installer builds

Removes the single-command Python packaging method (build/make_release.py
+ build/build_portable_zip.py + build/macos/build_zip.sh) and the portable
.zip artifacts it produced. Release builds go back to the original GitHub
Actions process: the CI matrix builds one installer per platform (.dmg /
.exe / .AppImage) on tag push and attaches them to a GitHub Release.

Tesseract OCR bundling is preserved: the fetch helpers the workflow depends
on (fetch_tessdata, fetch_tesseract_for_platform) are extracted into a
standalone build/tesseract.py, which build.yml now imports.

Docs (README, build/README, DEVELOPER, TECHNICAL, USER-GUIDE, vendor README,
es translations) updated to drop the portable-zip flavor and point at the
new module.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

build/datatools.spec

@@ -105,7 +105,7 @@ datas += [
 ]
 
 # ----- Tesseract OCR bundle ----------------------------------------
-# ``build/make_release.py`` stages the per-platform Tesseract binary
+# ``build/tesseract.py`` stages the per-platform Tesseract binary
 # + its runtime libs (DLLs/dylibs/sos) into
 # ``build/_tesseract/<target>/`` and the shared eng.traineddata into
 # ``build/vendor/tessdata/``. We add both to ``datas`` so PyInstaller
@@ -119,16 +119,16 @@ datas += [
 # from ``Path(sys._MEIPASS) / "tesseract" / ...``. Keep the two ends
 # in sync — if you rename "tesseract" here, update pdf_extract.py too.
 #
-# The orchestrator (make_release.py) sets DATATOOLS_TESS_STAGING to
-# the right per-platform dir before invoking PyInstaller. For ad-hoc
-# `pyinstaller build/datatools.spec` runs without the orchestrator,
-# fall back to the canonical staging path.
+# CI (.github/workflows/build.yml) sets DATATOOLS_TESS_STAGING to the
+# right per-platform dir before invoking PyInstaller. For ad-hoc
+# `pyinstaller build/datatools.spec` runs without that env var, fall
+# back to the canonical staging path.
 _tess_staging_env = os.environ.get("DATATOOLS_TESS_STAGING")
 if _tess_staging_env:
     _tess_staging = Path(_tess_staging_env)
 else:
     # Pick the obvious per-host staging dir as a fallback so spec-only
-    # builds (without the orchestrator) still work in dev.
+    # builds (without the CI env var) still work in dev.
     import sys as _sys_for_target
     _target_guess = (
         "win" if _sys_for_target.platform.startswith("win")
@@ -149,8 +149,8 @@ else:
     # though, since the OCR feature will silently fail at runtime.
     print(
         f"WARNING: {_tess_staging} is empty or missing — OCR will be "
-        "disabled in the bundle. Run build/make_release.py (which "
-        "calls fetch_tesseract_for_platform) before pyinstaller, or "
+        "disabled in the bundle. Run build/tesseract.py's "
+        "fetch_tesseract_for_platform before pyinstaller, or "
         "pre-stage the binary manually."
     )
 
@@ -159,8 +159,8 @@ if (_tessdata / "eng.traineddata").exists():
 else:
     print(
         f"WARNING: {_tessdata}/eng.traineddata is missing — OCR will "
-        "have no language data at runtime. Run build/make_release.py "
-        "or fetch manually per build/vendor/README.md."
+        "have no language data at runtime. Run build/tesseract.py's "
+        "fetch_tessdata or fetch manually per build/vendor/README.md."
     )
 
 # Bundle the Apache-2.0 LICENSE text alongside the binary. The docs