[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>

README.md

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+# GPS-Denied Onboard Runtime
+
+Scaffold for the Jetson-hosted GPS-denied localization runtime, replay harness, and
+deployment evidence paths.
+
+The project uses a Python `src/` layout for orchestration code, with native bridge
+directories reserved for BASALT, feature matching, and TensorRT integrations.
+Generated mission data, FDR payloads, cache payloads, and raw frame dumps are kept
+out of git unless they are explicitly curated test fixtures.
+
+## Local Development
+
+```bash
+python3 -m venv .venv
+source .venv/bin/activate
+python -m pip install -e ".[dev]"
+python -m pytest
+```
+
+Local replay infrastructure is described in `docker-compose.yml`; CI and black-box
+test infrastructure are described in `docker-compose.test.yml`.