Make codebase query results readable in VS Code

[forhappy]

Summary

• request the existing typed natural-discovery JSON contract from the Compass CLI
• render query answers as an itemized trace with overview metrics, source-linked symbol cards, relationship flows, evidence, diagnostics, and bounded/no-match states
• number and wrap CompassQL rows while preserving legacy prose and traversal fallbacks
• document the behavior and regenerate the deterministic embedded viewer assets

Compatibility

This does not change the Compass CLI or its public query schema. The VS Code extension now opts into the existing --format json discovery output.

Verification

• npm ci
• npm run typecheck:js
• npm run test:js (205 viewer tests, 121 VS Code tests, 86 browser tests)
• node scripts/check_viewer_assets.mjs
• npm run package -w editors/vscode
• npm run smoke:vsix -w editors/vscode

Packaged locally as editors/vscode/crabbuild-compass-vscode-0.3.18.vsix.