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/logging_config.py

@@ -0,0 +1,61 @@
+"""Structured logging via structlog with stdlib bridge.
+
+All modules use ``get_logger(__name__)`` and emit key/value pairs.
+"""
+
+from __future__ import annotations
+
+import logging
+import sys
+from typing import Any
+
+import structlog
+
+from app.config import settings
+
+
+def configure_logging() -> None:
+    level = getattr(logging, settings.app_log_level.upper(), logging.INFO)
+
+    timestamper = structlog.processors.TimeStamper(fmt="iso", utc=True)
+
+    shared_processors: list[Any] = [
+        structlog.contextvars.merge_contextvars,
+        structlog.stdlib.add_log_level,
+        structlog.stdlib.add_logger_name,
+        timestamper,
+        structlog.processors.StackInfoRenderer(),
+        structlog.processors.format_exc_info,
+    ]
+
+    structlog.configure(
+        processors=shared_processors
+        + [structlog.stdlib.ProcessorFormatter.wrap_for_formatter],
+        logger_factory=structlog.stdlib.LoggerFactory(),
+        wrapper_class=structlog.stdlib.BoundLogger,
+        cache_logger_on_first_use=True,
+    )
+
+    formatter = structlog.stdlib.ProcessorFormatter(
+        foreign_pre_chain=shared_processors,
+        processors=[
+            structlog.stdlib.ProcessorFormatter.remove_processors_meta,
+            structlog.processors.JSONRenderer(),
+        ],
+    )
+
+    handler = logging.StreamHandler(sys.stdout)
+    handler.setFormatter(formatter)
+
+    root = logging.getLogger()
+    root.handlers.clear()
+    root.addHandler(handler)
+    root.setLevel(level)
+
+    # Quiet down noisy libs
+    for noisy in ("urllib3", "botocore", "s3transfer", "elasticsearch", "opensearch", "httpx"):
+        logging.getLogger(noisy).setLevel(logging.WARNING)
+
+
+def get_logger(name: str | None = None) -> structlog.stdlib.BoundLogger:
+    return structlog.get_logger(name)