fix: sync remote sessions across extension surfaces

[marius-kilocode]

Remote control was only fully wired into the sidebar. Running /remote from Agent Manager silently did nothing because its embedded provider did not receive the shared remote status service, and Agent Manager only reported its selected session while omitting other open tabs. Opening a sidebar session at the same time could also leave that session unregistered or let overlapping heartbeat snapshots arrive out of order, causing one surface's session set to replace the other remotely.

This injects the extension-scoped remote service into Agent Manager and reports every real Agent Manager tab by session ID, excluding pending drafts and preserving multiple sessions in the same worktree. New sidebar sessions register as focused immediately, while closing Agent Manager clears its registrations.

Viewed-session updates and WebSocket heartbeats are serialized and coalesced so sidebar, editor, and Agent Manager state is combined into one ordered remote snapshot. The result is one shared remote connection that keeps all concurrently open extension sessions available without one surface dropping another.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (16 files)

• .changeset/remote-agent-manager-sessions.md
• packages/kilo-vscode/src/KiloProvider.ts - 3 changes for session focus registration
• packages/kilo-vscode/src/agent-manager/AgentManagerProvider.ts - remote cleanup on panel close
• packages/kilo-vscode/src/agent-manager/vscode-host.ts - remote service wiring
• packages/kilo-vscode/src/extension.ts - remote service injection
• packages/kilo-vscode/src/services/cli-backend/connection-service.ts - viewed serialization/coalescing
• packages/kilo-vscode/src/services/cli-backend/connection-service.test.ts - serialization test
• packages/kilo-vscode/tests/unit/agent-manager-arch.test.ts - arch test coverage
• packages/kilo-vscode/tests/unit/extension-arch.test.ts - arch test coverage
• packages/kilo-vscode/tests/unit/navigate.test.ts - remoteSessions tests
• packages/kilo-vscode/webview-ui/agent-manager/AgentManagerApp.tsx - reportRemoteSessions integration
• packages/kilo-vscode/webview-ui/agent-manager/navigate.ts - remoteSessions helper
• packages/kilo-vscode/webview-ui/agent-manager/remote-sessions.ts - new reactive reporting module
• packages/opencode/src/kilo-sessions/kilo-sessions.ts - delegated heartbeat to connection
• packages/opencode/src/kilo-sessions/remote-ws.ts - heartbeat serialization
• packages/opencode/test/kilocode/sessions/remote-ws.test.ts - heartbeat serialization test

---

_{Reviewed by deepseek-v4-pro-20260423 · 566,553 tokens}

_{Review guidance: REVIEW.md from base branch main}