feat(telemetry): add isolated beta quality diagnostics and release identity

scripts/stamp_build_revision.py

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+"""Stamp the exact source revision into distributable artifacts (build time only)."""
+
+import argparse
+from pathlib import Path
+import re
+import subprocess
+
+
+def stamp(root: Path, revision: str | None = None) -> str:
+    if revision is None:
+        revision = subprocess.check_output(['git', 'rev-parse', '--verify', 'HEAD'], cwd=root, text=True).strip()
+    if not re.fullmatch(r'[0-9a-f]{40}', revision):
+        raise ValueError('Build revision must be a full lowercase Git SHA')
+    target = root / 'src/langbot/_build_info.py'
+    target.write_text(f'"""Exact source revision stamped at artifact build time."""\n\nCORE_REVISION = {revision!r}\n')
+    return revision
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('--revision')
+    args = parser.parse_args()
+    print(stamp(Path(__file__).resolve().parents[1], args.revision))