docs: add canonical IA landing + first-pass core pages

docs/03-development.md

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+# Development
+
+This is the contributor-focused dev workflow for the Mission Control repo.
+
+## Prereqs
+- Docker + Docker Compose
+- Node (for the frontend)
+- Python (for the backend)
+
+## Common commands
+- See `Makefile` for the canonical targets.
+- Self-host stack (dev-ish): follow the [Quickstart](02-quickstart.md).
+
+## Local services
+- Postgres is provided by Compose (`compose.yml`).
+
+## Debugging tips
+- Backend liveness: `GET /healthz`
+- Backend routes live under `/api/v1/*` (see `backend/app/main.py`).
+
+## Next (to flesh out)
+- Document the exact backend/frontend dev commands used by maintainers (once finalized).
+- Add a “how to run tests” pointer to `docs/testing/README.md`.