feat(workbench): start session-runtime federation for issue 789

[Hailaylin]

Summary

• add a SessionInteropAdapter / 会话桥接适配层 for workbench session/runtime projection
• preserve legacy chat handoff when runtime panes exist and make focusSession work in AgentsPage
• move 工作台测试 / Workbench test exposure behind a direct developer-mode setting instead of the old feature-toggle overlay
• refresh related unit and Playwright coverage, including current runtime aggregation fixture contracts

Scope

This PR starts #789 as the next step after merged #781.

Included in this batch

• SessionInfo -> SessionObject read-model bridge on the front end
• PTY / SSH -> RuntimeBinding projection for workbench semantics
• workbench -> agents handoff completion for terminal focus
• developer settings flattening for feature toggles and workbench test visibility

Not included yet

• drag-and-drop
• cross-window federation
• EventTape formal runtime persistence
• full AgentsPage.tsx decomposition from #535

Verification

• bunx tsc --noEmit
• bunx vitest run tests/unit/settings/settings-registry-coverage.test.ts tests/unit/components/settings/DeveloperSection.test.tsx tests/unit/components/settings/DesktopAdaptiveToggle.test.tsx tests/unit/ui/desktop-settings-shell.issue198.test.ts tests/unit/ui/agent-hub/agents-page.focus-session.issue789.test.tsx tests/unit/ui/agent-hub/agents-page.session-actions.issue523.test.tsx tests/unit/ui/workbench/WorkbenchPage.issue789.test.tsx tests/unit/ui/workbench/WorkbenchPage.issue777.test.tsx tests/unit/ui/workbench/workbench-session-interop.issue789.test.ts tests/unit/ui/workbench/workbench-runtime.issue777.test.ts
• bunx playwright test tests/e2e/settings-desktop.issue198.test.ts tests/e2e/workbench.issue777.test.ts tests/e2e/agents-page.issue201.test.ts --config tests/e2e/playwright.issue777.config.ts

Issues

• refs phase1(agent-workbench): Slice B2 — session-runtime 联邦接入（PTY/SSH） #789
• continues phase1(agent-workbench): 平铺工作台（Flat Workbench）与跨窗口联邦前置抽象 #777

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	exomind	d2bce76	Mar 31 2026, 10:09 AM