Improve VS Code query UX and unify Compass workspace

[forhappy]

Summary

• consolidate the duplicate Repository and Operations sidebar surfaces into one native Workspace tree
• expose each workflow once through Explore and Maintain, with conditional active, setup, and recovery states
• add a read-only Workspace status refresh and state-aware repository targeting for multi-root actions
• move the query Run/Cancel control into a unified composer footer and left-align CompassQL parameters
• preserve VS Code theme, focus, high-contrast, and responsive behavior
• update extension documentation, generated viewer assets, and post-implementation regression coverage

Why

The previous sidebar repeated Code graph and Codebase evolution across repository
children, Operations, and title actions. The query composer also separated its
primary action and parameters from the input surface. These changes reduce
cognitive load and give Compass one predictable, VS Code-native interaction model.

User impact

Users now get one minimal Workspace view with explicit repository state, unique
workflows, conditional operations, and reliable multi-root selection. The query
composer keeps parameters and execution controls together and remains usable at
narrow editor widths.

Validation

• npm run test:js — 31 viewer unit tests, 37 extension unit tests, and 48 Playwright tests passed
• npm run typecheck:js
• npm run build
• npm run test:integration -w editors/vscode — VS Code extension-host test passed
• npm run package -w editors/vscode
• npm run smoke:vsix -w editors/vscode
• graphify update .