Summary

• sync the remaining PR5 runtime-core delta across config, effect, and server layers
• land the new server/routes/** path layer with compatibility wrappers over the proven PawWork implementations
• wire remote workspace HTTP proxying through the active fence/sync path and fix the default-directory routing regression found in review
• restore upstream-backed config, effect, and server regression tests, plus keep PawWork-only regressions in the verification set

Why

This continues the #27 runtime-core sync work for PR5. The goal is to bring the remaining upstream runtime behavior into PawWork without widening into project, session, app, or desktop lanes, while preserving current PawWork-specific behavior where the surfaces differ.

Related Issue

Part of #27

How To Verify

cd packages/opencode && bun test test/config test/effect test/server --timeout 30000
cd packages/opencode && bun run typecheck
cd packages/opencode && bun run build
cd packages/opencode && bun test test/server/default-directory.test.ts test/server/workspace-router.test.ts test/server/session-actions.test.ts test/server/session-messages.test.ts --timeout 30000

Screenshots or Recordings

N/A, no visible UI changes.

Checklist

• I ran the relevant verification steps
• I tested visible changes manually when needed
• I am targeting the dev branch