Convert a chat message into one or more board-task drafts.

Generates a list of `{ subject, description }` task drafts from a chat message. In the Nurama web app this backs the "Generate with Nu" option in a message's create-task menu; the returned `tasks` array seeds the task creator's draft list. **Compound capability requirement.** Unlike Polish, this endpoint requires BOTH the `boards` capability (checked against the project) and the `ai` capability (checked against the workspace); both `workspaceId` and `projectId` must belong to an active subscription. Either capability missing returns `capabilityNotAvailable`. **Context window.** `contextMessages` is the preceding chat thread (oldest first). The server caps at 10 messages and each entry's `content` at 8000 characters; supply the messages immediately before the focal one so the model can resolve pronouns and references. **Permission.** Requires `canAiGenerateTasks` (held by all workspace/project admins and by the creator, reviewer and reviewerAdmin roles). **Pre-prompt.** If the workspace or project has `aiTaskGenerationPreprompt` configured, it is appended to the system prompt as an override block (project value wins per-key). Separate from `aiCustomPreprompt` so admins can tune task style without affecting Polish or Chat output. Caps: - `messageText` is capped at 8000 characters. - `contextMessages` is capped at 10 entries; each entry's `content` is capped at 8000 characters and `authorName` at 100. - At most 10 tasks are returned.

curl -X POST "https://example.com/ai/task-generation" \  -H "Content-Type: application/json" \  -d '{    "workspaceId": "ef0efa32-d1c1-43d4-a5e2-fe7b4f00403c",    "projectId": "5a8591dd-4039-49df-9202-96385ba3eff8",    "messageText": "string"  }'

{  "tasks": [    {      "subject": "Draft launch checklist",      "description": "List every step needed before go-live."    },    {      "subject": "Notify stakeholders",      "description": "Email the launch plan to leadership."    }  ],  "billedCredits": 4,  "balanceAfter": 9996,  "eventId": "0193e4a1-b2c3-7000-8000-00000000abcd"}