fix(server): abort OpenCode child sessions on interrupt

[NitayRabi]

Summary

• enumerate OpenCode child sessions when interrupting a turn
• abort child/sub-agent sessions before aborting the parent session
• preserve parent abort behavior when child enumeration is unsupported or fails
• add regression coverage for multiple child sessions

Closes #7769.

Why

OpenCode sub-agents use child sessions. Relying only on session.abort(parent) leaves T3 dependent on the installed OpenCode version propagating cancellation to all children. When that propagation fails, the child provider stream remains alive and can occupy a single-slot local inference server indefinitely.

Validation

• vp test apps/server/src/provider/Layers/OpenCodeAdapter.test.ts (33 passed)
• vp run --filter t3 typecheck
• vp fmt --check apps/server/src/provider/Layers/OpenCodeAdapter.ts apps/server/src/provider/Layers/OpenCodeAdapter.test.ts
• git diff --check

Note

Abort OpenCode child sessions before parent in interruptTurn

• interruptTurn now queries context.client.session.children and aborts each child session concurrently before aborting the parent, continuing even if individual child aborts fail.
• Adds the abortOpenCodeSessionTree helper to OpenCodeAdapter.ts to encapsulate this ordering and error handling.
• Extends the test double and mock utilities to simulate child sessions, with a new test asserting child IDs appear in abortCalls before the parent session URL.
• Risk: session.children failures default to an empty list, so a failing children query silently skips child aborts rather than surfacing the error.

📊 Macroscope summarized 05630bb. 1 file reviewed, 1 issue evaluated, 0 issues filtered, 1 comment posted

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