Lab: Body already consumed error on logConfig.get and device.getPosture

Description

Several model methods fail with "Body already consumed" error when executed:

@john/tailscale-log-config → get method (both logType: configuration and logType: network)
@john/tailscale-device → getPosture method

Steps to Reproduce

# Log config - fails
swamp model method run my-log-config get --input '{"logType": "configuration"}' --json
# Output: {"error": "Body already consumed"}

# Device posture - fails
swamp model method run my-devices getPosture --input '{"deviceId": "7548945651797101"}' --json
# Output: {"error": "Body already consumed"}

Both fail identically via workflow steps and direct CLI invocation. Other methods on the same models work fine (e.g., device.get, device.getRoutes, device.list).

Expected Behavior

The methods should return the API response data.

Environment

swamp version: 20260227.225234.0-sha.2b2b28be
Extension: @john/tailscale (version 2026.02.28.2)
OS: macOS (Darwin 22.6.0)

Summary

This appears to be a bug in the HTTP response handling within the extension model runtime. The Tailscale API responses for these endpoints are likely being read/consumed before the model method tries to parse them. The fix would involve investigating the response body handling in the model execution pipeline for these specific methods — possibly they return a different content type or response structure that triggers premature body consumption.

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