chore: bootstrap repository with governance docs

Initialize git, add Apache-2.0 LICENSE, .gitattributes (LF line
endings), AGENTS.md (entry points, stack, discovery order, baseline
checks), RUNBOOK.md (dev boot, prod deploy with overlay, ingestion,
failures, rollback, scaling notes), .env.prod.example with rotated
credential placeholders, and dev-only warnings on .env.example.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/ingestion/normalizer.py

@@ -0,0 +1,12 @@
+"""Block-level normalization wrappers around utils.text_cleaning."""
+
+from __future__ import annotations
+
+from app.utils.text_cleaning import clean_ocr_text, normalize_for_search
+
+
+def normalize_block(text: str) -> tuple[str, str]:
+    """Return ``(display_text, normalized_text)``."""
+    display = clean_ocr_text(text)
+    norm = normalize_for_search(display)
+    return display, norm