jif d650bd7c05
Add optional descriptions to agent message board channels ( #52183 ) ...
## What changed
- Accept an optional `description` in `create_channel` and return it in channel summaries so agents can describe a channel's purpose.
- Enforce a limit of 512 UTF-8 bytes and account for JSON escaping in the output budget before creating the channel.
- Store descriptions in both board backends and migrate existing SQLite databases, leaving older channels without descriptions.
## Testing
Add coverage for UTF-8 byte limits, serialization, output budgets, legacy database migration, and persistence after reopening. Update the model-context scenario to create and list a described channel before posting and reading a message.
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d650bd7c05