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>

scripts/reindex_document.py

@@ -0,0 +1,24 @@
+"""Re-run the pipeline for a single document by ID."""
+
+from __future__ import annotations
+
+import sys
+import uuid
+
+import click
+
+from app.ingestion.pipeline import process_document_id
+from app.logging_config import configure_logging
+
+configure_logging()
+
+
+@click.command()
+@click.option("--document-id", required=True, type=str)
+def main(document_id: str) -> None:
+    result = process_document_id(uuid.UUID(document_id))
+    click.echo(result)
+
+
+if __name__ == "__main__":
+    sys.exit(main(standalone_mode=True) or 0)