[docs] Update documentation for Gemini engine and new ecosystem identifiers

[github-actions]

Documentation Updates - 2026-02-20

This PR updates the documentation based on features merged in the last 24 hours.

Features Documented

• Google Gemini engine (from fix: Gemini engine uses .gemini/settings.json instead of unsupported --mcp-config flag #16938 and fix: add --yolo flag to Gemini CLI for auto-approving tool executions #16983): Added as a supported AI engine in the engines reference
• New ecosystem identifiers (from Add ecosystem domains for clojure, elixir, kotlin, scala, zig #17072): Added clojure, elixir, kotlin, scala, zig to the network permissions reference; expanded all ecosystem rows with domain details

Changes Made

• Updated docs/src/content/docs/reference/engines.md:
  • Added Google Gemini to the Available Coding Agents list
  • Added a full "Using Google Gemini" setup section covering engine: gemini, GEMINI_API_KEY, and the .gemini/settings.json MCP configuration approach
• Updated docs/src/content/docs/reference/network.md:
  • Replaced the compact multi-language row in the Ecosystem Identifiers table with individual rows for each identifier, each with key domains listed
  • Added new rows for clojure, elixir, kotlin, scala, and zig

Merged PRs Referenced

• fix: Gemini engine uses .gemini/settings.json instead of unsupported --mcp-config flag #16938 - fix: Gemini engine uses .gemini/settings.json instead of unsupported --mcp-config flag
• fix: add --yolo flag to Gemini CLI for auto-approving tool executions #16983 - fix: add --yolo flag to Gemini CLI for auto-approving tool executions
• Add ecosystem domains for clojure, elixir, kotlin, scala, zig #17072 - Add ecosystem domains for clojure, elixir, kotlin, scala, zig

Notes

The following changes from the 24-hour window were reviewed but not documented as they are internal fixes or not user-facing:

• fix: don't redact GH_AW_* env vars in compile error suggestions #17029: Fix redaction of GH_AW_* env vars in compile errors (internal sanitization logic)
• Enforce no-secrets check on engine.env in addition to top-level env #17065: Enforce no-secrets check on engine.env (security hardening, existing behavior documented)
• Fix HTTP 404 when running gh aw init in codespaces #16952: Fix HTTP 404 for gh aw init in codespaces (bug fix, no new feature)
• Bundle WASM release assets into versioned archive #16948: Bundle WASM assets as versioned tar.gz (release pipeline change; wasm-compilation.md covers building from source, not release asset downloads)
• Add ToolAnnotations to all 8 MCP server tools #16921: Add ToolAnnotations to MCP server tools (internal MCP metadata; no user-visible behavior change)

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• expires on Feb 21, 2026, 4:25 AM UTC