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

docs/architecture/storage-model.md

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+# Storage Model
+
+AIWorkspace uses different storage locations for different kinds of data. This keeps the product shareable, the project context auditable, and local runtime state disposable.
+
+## Storage Responsibilities
+
+| Data | Target Location | Git? | Notes |
+|---|---|---:|---|
+| Core product code | `~/Developer/ai-workspace` | yes | Shared reusable product. |
+| Project manifest | `<context-pack>/aiw.project.json` | yes | Project identity and relative paths. |
+| Canonical memory | `<context-pack>/knowledge/` | usually yes | Human-readable Markdown. |
+| Raw evidence | `<context-pack>/inbox/` | usually no/private | Captured messages, screenshots, exports. |
+| Connector config | `<context-pack>/connectors/` | depends | Safe config can be tracked; secrets must not be tracked. |
+| Project prompts/agents | `<context-pack>/prompts/`, `<context-pack>/agents/` | depends | Track if safe for the team. |
+| User registry | `~/Library/Application Support/AIWorkspace/` | no | Local project registration and preferences. |
+| Logs | `~/Library/Logs/AIWorkspace/` | no | Service and app logs. |
+| Caches/indexes | `~/Library/Caches/AIWorkspace/` | no | Rebuildable derived data. |
+| Runtime/PIDs | `~/Library/Application Support/AIWorkspace/runtime/` | no | Local service state. |
+
+## Canonical Memory
+
+Canonical memory is the durable project source of truth for humans and AI.
+
+Target structure:
+
+```text
+knowledge/
+  current/
+  work-items/
+  systems/
+  workstreams/
+  people/
+  decisions/
+  daily/
+  templates/
+```
+
+Canonical memory should be:
+
+- readable without AIWorkspace;
+- reviewable in Git when shared;
+- explicit about uncertainty;
+- updated by humans or agents using small auditable changes.
+
+## Raw Evidence
+
+Raw evidence is input, not truth.
+
+Examples:
+
+```text
+inbox/
+  mattermost/
+  slack/
+  photos/
+  documents/
+  screenshots/
+```
+
+Raw evidence should not be promoted automatically into durable memory unless a workflow explicitly classifies it as high-confidence and project-relevant.
+
+## Derived Indexes
+
+Indexes are rebuildable.
+
+They should live outside the context pack by default:
+
+```text
+~/Library/Caches/AIWorkspace/indexes/<project>/
+```
+
+This prevents large derived artifacts from polluting project memory repositories.
+
+## Runtime State
+
+Service logs, PID files, and health snapshots should be local machine state.
+
+Target locations:
+
+```text
+~/Library/Logs/AIWorkspace/
+~/Library/Application Support/AIWorkspace/runtime/
+```
+
+Runtime state should not be used as project memory.
+
+## Secrets
+
+Secrets should not be stored in context packs unless they are encrypted and explicitly supported.
+
+Preferred approaches:
+
+- macOS Keychain references;
+- ignored local `.env` files;
+- environment variables;
+- enterprise-approved credential stores.
+
+Documentation, manifests, and generated configs should refer to secret names, not secret values.