feat: bootstrap vela UI and gateway workspace

Establish the monorepo, tooling, and starter apps so UI and gateway development can begin from a documented, runnable baseline.

README.md

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+# Vela
+
+Vela is a local-first, voice-first assistant designed around a browser PWA, a gateway service, and self-hosted integrations for speech, LLM orchestration, home automation, search, and speech synthesis.
+
+## Documentation
+
+- [Project overview](docs/overview.md)
+- [Architecture](docs/architecture.md)
+- [Event protocol and state machine](docs/protocol.md)
+- [Integrations and tool safety](docs/integrations.md)
+- [Deployment and operations](docs/deployment.md)
+- [Setup and workspace usage](docs/setup.md)
+- [Phased backlog](docs/backlog.md)
+- [README migration map](docs/readme-migration-map.md)
+
+## Development
+
+- Use **mise** for tooling in this repository.
+- Use **Yarn** as the package manager once provisioned by mise.
+- Bootstrap tools with `mise install`.
+- Run repo commands with `mise exec -- yarn …` if your shell is not activated for mise.
+- Install workspace dependencies with `mise exec -- yarn install`.
+- Start the SvelteKit UI with `mise exec -- yarn dev:ui`.
+- Start the Fastify gateway with `mise exec -- yarn dev:gateway`.
+- Build the UI with `mise exec -- yarn build:ui` and run the UI check with `mise exec -- yarn check:ui`.
+
+## Working Agreement
+
+- [AGENTS.md](AGENTS.md) defines how implementation work and documentation should stay aligned.
+
+## Status
+
+The repository now includes a minimal runnable SvelteKit UI and a minimal runnable Fastify gateway as the baseline for the next vertical slices.