[AZ-701] Fix Jetson e2e harness infrastructure blockers

- gtsam_isam2_estimator: shim for gtsam>=4.3a0 aarch64 pre-release
  where IncrementalFixedLagSmoother/FixedLagSmootherKeyTimestampMap
  moved from gtsam_unstable to gtsam
- inference_factory: eager import of c7_inference package so
  register_component_block runs before config.components is read
- docker-compose.test.jetson.yml: remove companion and
  operator-orchestrator (not needed by replay CLI tests and crash
  in test env due to AZ-618 live-mode deps); add db-migrate and
  tile-init setup-profile services for Alembic migrations and FAISS
  fixture provisioning; update e2e-runner depends_on to db only
- scripts/mk_test_faiss_fixture.py: generate minimal HNSW32 FAISS
  descriptor index into the tile-data volume for the test harness

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

src/gps_denied_onboard/runtime_root/inference_factory.py

@@ -20,6 +20,13 @@ from typing import TYPE_CHECKING
 
 from gps_denied_onboard.runtime_root.errors import RuntimeNotAvailableError
 
+# Eager package import so c7_inference.__init__.py runs
+# `register_component_block("c7_inference", C7InferenceConfig)` before
+# `_c7_config(config)` reads `config.components["c7_inference"]` below.
+# The package __init__.py is import-safe (no concrete strategy modules)
+# per the Risk-2 mitigation documented in c7_inference/__init__.py.
+import gps_denied_onboard.components.c7_inference  # noqa: F401
+
 if TYPE_CHECKING:
     from gps_denied_onboard.components.c7_inference import (
         C7InferenceConfig,