Add workspace foundation

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Summary

• Add first-class workspace tables, migration support, and store APIs for local/cloud workspace records.
• Create an explicit local workspace during setup with the default name "Chorus Local".
• Add workspace-scoped channel creation coverage plus setup and invalid workspace mode tests.
• Add workspace management API/CLI/UI support for create, list, switch, delete, active workspace display, and workspace resource counts.
• Add the empty-run warning behavior so silent natural completions post a system warning to the triggering channel.

Notes

• This is the foundation slice for cloud platform workspace architecture, not full route-level workspace scoping yet.
• Agent names remain globally unique for now because agent_env_vars still references agents(name).
• chorus workspace create creates a workspace without switching to it; explicit chorus workspace switch <name> changes the active workspace.

Test Plan

• cargo test
• cd ui && npm run test
• cd ui && npx tsc --noEmit
• cd ui && npm run build
• browser dogfood of workspace create/list in Settings

[Copilot]

Pull request overview

This PR introduces the initial “workspace foundation” layer in the store/CLI, adding workspace persistence and basic APIs, creating a default local workspace during chorus setup, and adding early workspace-scoped channel creation coverage. It also adds a user-visible “empty-run warning” when an agent completes a run without sending a message.

Changes:

• Add workspace tables + migrations, plus store APIs to create/list/read active workspaces.
• Update channel storage to support workspace scoping (workspace_id + per-workspace name uniqueness) and add create_channel_in_workspace.
• Update chorus setup to ensure a local workspace exists (default “Chorus Local”) and add related tests; add empty-run warning behavior + tests.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tests/store_tests.rs	Adds tests for workspace creation/ownership, workspace-scoped channel naming, and unknown workspace mode errors.
src/store/workspaces.rs	New workspace data model + Store APIs for creating a local workspace, getting active workspace, and listing workspaces for a human.
src/store/schema.sql	Adds workspace tables and introduces workspace_id + new uniqueness strategy for channels/agents/teams.
src/store/mod.rs	Exposes the new workspaces module/types from the store.
src/store/migrations.rs	Adds workspace foundation migration: new tables, workspace_id columns, and uniqueness indexes.
src/store/channels.rs	Adds create_channel_in_workspace for explicit workspace-aware channel creation.
src/cli/setup.rs	Ensures an explicit local workspace exists during setup; adds tests and displays workspace info.
src/agent/event_forwarder.rs	Posts a system warning if a run completes “naturally” without invoking send_message; adds tests.
docs/CLI.md	Documents setup creating a local workspace and the non-interactive default name.
VERSION	Bumps version to 0.0.2.0.
CHANGELOG.md	Adds release notes entry for empty-run warnings (fixes #97).

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Testing position

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Review Summary

Solid foundation PR. The workspace data model is clean, migrations are safe (legacy indices for NULL workspace_id rows), and the resource-isolation tests give confidence. I noted a few concerns around async runtime ergonomics and request-handler I/O that are worth addressing before merge.

Approve with suggestions — nothing blocking, but I'd recommend the RwLock and local_human changes.

See inline comments for details.