docs: add initial project architecture, concepts, and quick-start documentation

docs/README.md

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+# AIWorkspace Documentation
+
+AIWorkspace is a local context platform for developers. It connects project evidence, canonical human-readable memory, local services, and AI clients without making any single AI tool the source of truth.
+
+This documentation describes the target production architecture: reusable AIWorkspace core separated from project-specific AI context packs.
+
+## Start Here
+
+- [Concepts: Overview](concepts/overview.md)
+- [Concepts: Workspace vs Context Pack](concepts/workspace-vs-context-pack.md)
+- [Architecture: Storage Model](architecture/storage-model.md)
+- [Guide: Quick Start](guides/quick-start.md)
+- [Reference: Project Manifest](reference/project-manifest.md)
+
+## Documentation Map
+
+```text
+docs/
+  concepts/       Product concepts and user-facing mental model
+  architecture/   System boundaries, storage, services, and security
+  guides/         Task-oriented setup and usage guides
+  reference/      File formats, CLI, manifests, and environment variables
+```
+
+## Core Principle
+
+```text
+AIWorkspace provides context. Project context packs own project memory.
+```
+
+The core product should remain reusable and shareable. Project-specific facts, connector settings, people, channels, raw evidence, and prompts belong in separate context packs.