[AZ-263] Bootstrap: repo skeleton + Docker + CI + Alembic + Tier-1 tests

Implements the AZ-263 / E-BOOT initial structure task:

- Python src/-layout package `gps_denied_onboard/` with per-component
  interface stubs (14 components), type-only DTOs under `_types/`,
  shared helpers under `helpers/` (R14 LightGlue ownership), structured
  JSON logging, runtime composition root with env-var fail-fast gate,
  healthcheck module shared by Docker and CI smoke.
- CMake top-level + `cmake/{build_options,dependencies,strategies}.cmake`
  with the BUILD_* per-binary flags (ADR-002) and pinned external git
  refs for OKVIS2 / VINS-Mono / GTSAM / FAISS / OpenCV >=4.12.0.
- Three Dockerfiles (companion-tier1, operator-tooling,
  mock-suite-sat-service) + two compose files (dev + Tier-1 test).
- Four GitHub Actions workflows: ci.yml (lint/unit/integration/dual
  binary build/SBOM diff/security), ci-tier2.yml (self-hosted Jetson
  AC-bound NFTs), release.yml, cve-rescan.yml.
- Two CI gate scripts: `ci/sbom_diff.py` (deployment SBOM subset +
  R02 exclusion), `ci/opencv_pin_gate.py` (>=4.12.0 enforcement,
  D-CROSS-CVE-1).
- Alembic-driven Postgres 16 initial migration `0001_initial.py`
  mirroring satellite-provider tiles + flights + sector_classifications
  + manifests + engine_cache_entries (data_model.md s 2).
- Tier-1 test scaffolding: 95 passing unit tests covering every AC,
  per-component smoke tests, structured logging JSON output check,
  env-var gate check, healthcheck import check. Two CI-gated tests
  (cmake configure, actionlint) skip locally with explicit reasons.
- Batch report + code review report under `_docs/03_implementation/`.

Verdict: PASS_WITH_WARNINGS (two Low findings, both informational).
Co-authored-by: Cursor <cursoragent@cursor.com>

src/gps_denied_onboard/components/c7_inference/__init__.py

@@ -0,0 +1,6 @@
+"""C7 Inference Runtime component — Public API."""
+
+from gps_denied_onboard._types.manifests import EngineCacheEntry
+from gps_denied_onboard.components.c7_inference.interface import InferenceRuntime
+
+__all__ = ["EngineCacheEntry", "InferenceRuntime"]

src/gps_denied_onboard/components/c7_inference/interface.py

@@ -0,0 +1,18 @@
+"""C7 `InferenceRuntime` Protocol.
+
+Concrete impls: `TensorrtRuntime` (production-default; TensorRT 10.3),
+`OnnxTrtEpRuntime` (ONNX Runtime + TensorRT EP), `PytorchFp16Runtime` (research
+baseline). See `_docs/02_document/components/09_c7_inference/`.
+"""
+
+from __future__ import annotations
+
+from typing import Any, Protocol
+
+
+class InferenceRuntime(Protocol):
+    """Compiled-engine inference runtime."""
+
+    def infer(self, inputs: Any) -> Any: ...
+
+    def load(self, engine_path: str) -> None: ...