Update error message to say opencode instead of sst (anomalyco#81)

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Update CLI run command and session handling

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Co-Authored-By: OpenCode <[email protected]>

Update CLI run command and session handling

🤖 Generated with [OpenCode](https://opencode.ai)

Co-Authored-By: OpenCode <[email protected]>

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Update index.ts

🤖 Generated with [OpenCode](https://opencode.ai)

Co-Authored-By: OpenCode <[email protected]>

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