[AZ-839] [AZ-835] operator_pre_flight_setup real fixture (E-AZ-835 C3)

Replace the placeholder operator_pre_flight_setup pytest fixture (the
mkdir stub at tests/e2e/replay/conftest.py:293-310) with a real driver
that wires C1 (AZ-836 RouteSpec) + C2 (AZ-838 SatelliteProviderRoute
Client) + C11 (AZ-316 HttpTileDownloader) + C10 (AZ-322 Descriptor
Batcher) end-to-end and yields a typed PopulatedC6Cache. AZ-306 FAISS
sidecar triple-consistency is verified post-rebuild via a caller-
supplied descriptor_index_factory; partial sidecars are cleaned up on
failure (AC-7) while pre-existing warm-cache files are preserved.
Algorithm lives in tests/e2e/replay/_operator_pre_flight.py with
pure dependency injection so the AC-8 unit suite (11 tests covering
happy / transient-retry / terminal-failure / validation-error /
tamper-detection / cleanup-on-failure) runs against stubs and the
AC-9 Tier-2 integration test runs the same algorithm against the
real Jetson harness. The conftest fixture skip-gates on RUN_REPLAY
_E2E + SATELLITE_PROVIDER_URL/API_KEY + BUILD_FAISS_INDEX +
GPS_DENIED_OPERATOR_CONFIG_PATH and wires deps through the existing
runtime_root factories. Supersedes AZ-777 Phase 3.

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

_docs/_autodev_state.md

@@ -8,7 +8,7 @@ status: in_progress
 sub_step:
   phase: 7
   name: batch-loop
-  detail: "batch 108 next; AZ-839 C3"
+  detail: "batch 109 next; AZ-840 C4"
 retry_count: 0
 cycle: 3
 tracker: jira