[AZ-219] Scaffold onboard runtime project

Add the initial source, test, infrastructure, CI, configuration, and evidence-path scaffold so dependent implementation tasks have stable package and runtime boundaries.

Co-authored-by: Cursor <cursoragent@cursor.com>

e2e/replay/README.md

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+# Replay Harness
+
+Reserved for suite-level replay entry points that drive the runtime only through
+public files, MAVLink/cache/FDR interfaces, and published reports.

e2e/replay/run_replay.py

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+"""Replay runner entry point."""
+
+from pathlib import Path
+
+
+def main() -> int:
+    report_path = Path("e2e/reports/replay_smoke.txt")
+    report_path.parent.mkdir(parents=True, exist_ok=True)
+    report_path.write_text("replay scaffold ready\n", encoding="utf-8")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())