Add private agent task controls

[NarwhalChen]

Summary

• model Agent Host work as stable tasks with pause, resume, cancel, and redirect-to-successor lifecycle controls
• inject one agent-scoped task:manage_task tool only in direct messages, while keeping UI buttons on a direct IPC control path
• turn the existing DM context panel into a Work surface that shows real channel task state and private guidance controls
• migrate persisted Agent Host jobs to schema v3 and serialize concurrent controls per task

Verification

• pnpm --filter @convera/app test (506 passed, 1 skipped)
• pnpm --filter @convera/app lint (passes; 10 pre-existing warnings)
• pnpm --filter @convera/app format
• pnpm --filter @convera/app exec tsc --noEmit --skipLibCheck
• pnpm --filter @convera/app automation:typecheck
• pnpm --filter @convera/app automation:prepare under Node 22
• isolated hidden Electron profile: opened Sage DM Work panel, observed a real cancelled #general Agent Host task, expanded private redirect guidance, and captured an ignored automation screenshot

Boundaries

• no CI-only E2E spec was added; validation uses the existing atomic Electron automation MCP
• the real provider request created during UI setup was cancelled immediately; redirect submit was intentionally not invoked during UI smoke testing

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
foxyfox-docs	Skipped		Jul 31, 2026 3:49pm
foxyfox-website	Skipped		Jul 31, 2026 3:49pm