Bump Feather Wand 3.8.2

[QAInsights]

What's new

1. 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.
2. 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

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