Replace the single global SSE loop (scoped to the most-recently-used worktree directory) with one subscription per live opencode session, each scoped to that session's worktree dir. Two sessions in different worktrees now stream concurrently instead of the second silently dropping the first's events. Each session owns an AbortController (SessionState.sseAbort) wired into subscribe(..., {signal}); the loop reconnects, reconciles (per-session), and is torn down on closeSession/dispose by aborting the signal — which also fixes a latent Phase-1 bug where switching directories left the old runEventLoop parked forever in its for-await (zombie loops). A sessionID demux guard (eventSessionId) drops events that aren't this loop's own, so two sessions sharing a worktree (possible after P1.5-b) don't double-process each other's deltas. Removed sseRunning/sseDirectory/startEventLoop/runEventLoop/reconcileInFlight and the 'SSE directory changed' collision warning. dispatchEvent/handleUpdatedPart (translation, dedup, dcp-strip) and the watchdog are unchanged — only the subscription topology changed. SDK confirmed: @opencode-ai/sdk Event.subscribe opens an independent SSE connection per call, so N concurrent dir-scoped streams are supported. No schema/dispatcher/frontend changes; runExternalAgent untouched.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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