v0.3.19

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• 7706298 wave 103: fix typing animation hang after boss turn ends without text — tool-call-only turns (boss dispatches sub-agents with no plan text) left the boss-N typing placeholder Pending:true forever because maybeBossCompleted swallowed the completion and nothing else cleared it. OpenCode backend now emits a clearing EvChatBoss on session.idle for the primary (guarded against false mid-turn idles by checking textSess); Claude backend emits the same on the result event that pops the FIFO. The reducer's branch (c) learned to strip stale placeholders without appending an empty bubble when the clearing event arrives, making it a no-op on normal turns where streaming already stripped the placeholder.