Show OpenCode sessions as Waiting for pending approvals

[calvintvu]

Context

OpenCode keeps pending permission requests in memory. It does not store this state in the transcript database. The default TUI does not expose its permission API to other processes. Therefore, the collector cannot distinguish a permission wait from an ordinary running tool. The plugin sends the permission lifecycle to coSlash.

Changes

• Install a global OpenCode event plugin when coSlash starts. The global plugin also covers manually launched OpenCode sessions.
• Record only request IDs, session IDs, and process IDs. Do not record prompts, tool arguments, or decisions.
• Mark root sessions as Waiting for pending child or root approvals. Clear the state after a reply and ignore records from stopped processes.

Test

• go build ./... — passed
• node --check internal/vendors/opencode/coslash-waiting.js — passed
• git diff --check cvu/claude-wait...HEAD — passed
• Manual: pending approval showed Waiting; rejection returned the session to Busy.

Screenshots

• Session board — OpenCode session shows Waiting during a pending approval.