Bump Feather Wand 3.8.2

[QAInsights]

What's new

• Explicit Chat / Agent mode selector. The composer now defaults to safe Chat mode and only permits agentic JMeter tool calls after the user explicitly selects Agent mode.
• OpenAI and Anthropic gateway support. Route requests through custom OpenAI-compatible or Anthropic-compatible base URLs, provide gateway-specific headers, and configure model lists for gateways without model-discovery endpoints.

Improvements and fixes

• Added support for header-only gateway authentication while preserving API-key authentication.
• Added plaintext HTTP warnings for gateway URLs that could expose prompts or credentials.
• Improved gateway model discovery and filtering for non-OpenAI model IDs.
• Refreshed the vendored model-capability catalog and its Linux-based update workflow.
• Updated provider setup guidance and screenshots.