fix(serverless): decode arbitrary task outputs

[emmmile]

The CLI's generated Serverless task client now decodes arbitrary JSON outputs, so task reads and completed async resubmissions can carry strings and lists without failing JSON decoding. apps tasks show also prints scalar outputs.

Surface	Source and behavior
Task.output	Serverless task responses, any JSON value

This sync is needed before the task output contract update reaches dev.

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[Copilot]

Copilot review overview

🟢 Approval recommended

The schema, generated model, display path, and tests consistently support arbitrary JSON task outputs.

Review effort: Balanced
Findings: None

What changed in this PR

Updates Serverless task outputs to support any JSON value throughout the generated client and CLI display.

Changes:

• Generalizes the OpenAPI Task.output schema and generated Go type.
• Renders scalar task outputs.
• Adds coverage for scalar and list decoding.

File	Description
api/​serverless/​openapi.yaml	Defines output as arbitrary JSON.
internal/​api/​serverless/​gen/​client.gen.go	Regenerates Task.Output as interface{}.
internal/​api/​serverless/​tasks_test.go	Tests output decoding across task APIs.
internal/​cmd/​serverless/​display.go	Formats arbitrary output values.
internal/​cmd/​serverless/​apps_tasks_test.go	Tests scalar output rendering.

Files not reviewed (1)

• internal/api/serverless/gen/client.gen.go: Generated file

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