Add developer documentation for workspaces

docs/workspaces.md

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+# CodeGate Workspaces
+
+Workspaces help you group related resources together. They can be used to organize your
+configurations, muxing rules and custom prompts. It is important to note that workspaces
+are not a tenancy concept; CodeGate assumes that it's serving a single user.
+
+## Global vs Workspace resources
+
+In CodeGate, resources can be either global (available across all workspaces) or workspace-specific:
+
+- **Global resources**: These are shared across all workspaces and include provider endpoints,
+  authentication configurations, and personas.
+
+- **Workspace resources**: These are specific to a workspace and include custom instructions,
+  muxing rules, and conversation history.
+
+### Sessions and Active Workspaces
+
+CodeGate uses the concept of "sessions" to track which workspace is active. A session represents
+a user's interaction context with the system and maintains a reference to the active workspace.
+
+- **Sessions**: Each session has an ID, an active workspace ID, and a last update timestamp.
+- **Active workspace**: The workspace that is currently being used for processing requests.
+
+Currently, the implementation expects only one active session at a time, meaning only one
+workspace can be active. However, the underlying architecture is designed to potentially
+support multiple concurrent sessions in the future, which would allow different contexts
+to have different active workspaces simultaneously.
+
+When a workspace is activated, the session's active_workspace_id is updated to point to that
+workspace, and the muxing registry is updated to use that workspace's rules for routing requests.
+
+## Workspace Lifecycle
+
+Workspaces in CodeGate follow a specific lifecycle:
+
+1. **Creation**: Workspaces are created with a unique name and optional custom instructions and muxing rules.
+2. **Activation**: A workspace can be activated, making it the current context for processing requests.
+3. **Archiving**: Workspaces can be archived (soft-deleted) when no longer needed but might be used again.
+4. **Recovery**: Archived workspaces can be recovered to make them available again.
+5. **Deletion**: Archived workspaces can be permanently deleted (hard-deleted).
+
+### Default Workspace
+
+CodeGate includes a default workspace that cannot be deleted or archived. This workspace is used
+when no other workspace is explicitly activated.
+
+## Workspace Features
+
+### Custom Instructions
+
+Each workspace can have its own set of custom instructions that are applied to LLM requests.
+These instructions can be used to customize the behavior of the LLM for specific use cases.
+
+### Muxing Rules
+
+Workspaces can define muxing rules that determine which provider and model to use for different
+types of requests. Rules are evaluated in priority order (first rule in the list has highest priority).
+
+### Token Usage Tracking
+
+CodeGate tracks token usage per workspace, allowing you to monitor and analyze resource consumption
+across different contexts or projects.
+
+### Prompts, Alerts and Monitoring
+
+Workspaces maintain their own prompt and alert history, making it easier to monitor and respond to issues within specific contexts.
+
+## Developing
+
+### When to use workspaces?
+
+Consider using separate workspaces when:
+
+- You need different custom instructions for different projects or use cases
+- You want to route different types of requests to different models
+- You need to track token usage separately for different projects
+- You want to isolate alerts and monitoring for specific contexts
+- You're experimenting with different configurations and want to switch between them easily
+
+### When should a resource be global?
+
+Resources should be global when:
+
+- They need to be shared across multiple workspaces
+- They represent infrastructure configuration rather than usage patterns
+- They're related to provider connectivity rather than specific use cases
+- They represent reusable components like personas that might be used in multiple contexts
+
+### Exporting resources
+
+Exporting resources in CodeGate is designed to facilitate sharing workspaces between different instances.
+This is particularly useful for:
+
+- **Standardizing configurations**: When you want to ensure consistent behavior across multiple CodeGate instances
+- **Sharing best practices**: When you've developed effective muxing rules or custom instructions that others could benefit from
+- **Backup and recovery**: To preserve important workspace configurations before making significant changes
+
+When deciding whether to export resources, consider:
+
+- **Export workspace configurations** when they represent reusable patterns that could be valuable in other contexts
+- **Export muxing rules** when they represent well-tested routing strategies that could be applied in other instances
+- **Export custom instructions** when they contain general-purpose prompting strategies not specific to your instance
+
+Avoid exporting:
+- Workspaces with instance-specific configurations that wouldn't be applicable elsewhere
+- Workspaces containing sensitive or organization-specific custom instructions
+- Resources that are tightly coupled to your specific provider endpoints or authentication setup
+
+Note that conversation history, alerts, and token usage statistics are not included in exports as they
+represent instance-specific usage data rather than reusable configurations.