[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/config/__init__.py

@@ -0,0 +1,9 @@
+"""Config loader + dataclass schemas (owned by AZ-269 / E-CC-CONF).
+
+Bootstrap creates importable stubs so every component constructor can take a
+config argument from day one.
+"""
+
+from gps_denied_onboard.config.schema import RuntimeConfig
+
+__all__ = ["RuntimeConfig"]

src/gps_denied_onboard/config/loader.py

@@ -0,0 +1,16 @@
+"""Config loader — STUB.
+
+Concrete YAML + env-var loader is owned by AZ-269. Bootstrap exposes the load
+function as `NotImplementedError` so callers fail loudly until AZ-269 lands.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from gps_denied_onboard.config.schema import RuntimeConfig
+
+
+def load_runtime_config(yaml_path: Path) -> RuntimeConfig:
+    """Load a `RuntimeConfig` from a YAML file + environment overlay."""
+    raise NotImplementedError("Config loader concrete impl is AZ-269 (E-CC-CONF)")

src/gps_denied_onboard/config/schema.py

@@ -0,0 +1,26 @@
+"""Config dataclass schemas — STUB.
+
+Concrete YAML schema is owned by AZ-269. Bootstrap declares only the runtime-level
+config container so the composition root can type its `compose_*` signatures.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass(frozen=True)
+class RuntimeConfig:
+    """Runtime configuration loaded from YAML + env vars.
+
+    The concrete field set is filled in by AZ-269. This stub is enough for the
+    composition root + tests to import the type.
+    """
+
+    fc_profile: str = "ardupilot_plane"
+    tier: int = 1
+    db_url: str = ""
+    log_level: str = "INFO"
+    log_sink: str = "console"
+    extras: dict[str, Any] = field(default_factory=dict)