[plan] Fix minor engine parity gaps in overview.mdx, README, and engines.md

[github-actions]

Context

Created from the Claude Code User Documentation Review in discussion #31206.

Objective

Fix several small but impactful places where Gemini (and sometimes other engines) are omitted from engine lists, giving a false impression of what gh-aw supports.

Current State

1. docs/src/content/docs/introduction/overview.mdx line ~13: Lists "Copilot CLI, Claude by Anthropic, or Codex" — Gemini is omitted
2. README.md at-a-glance section: Never mentions which engines are supported
3. docs/src/content/docs/reference/engines.md line ~280: MCP sandboxing diagram engine list is (Copilot, Claude, Codex) — Gemini missing

Approach

1. docs/src/content/docs/introduction/overview.mdx line ~13: Add Gemini to the engine list: "Copilot, Claude, Codex, or Gemini"
2. README.md: Add a one-line "Supported engines: Copilot, Claude, Codex, Gemini" in the features/at-a-glance section near the top
3. docs/src/content/docs/reference/engines.md line ~280: Add Gemini to the engine list in the MCP sandboxing diagram text/caption

Files to Modify

• docs/src/content/docs/introduction/overview.mdx
• README.md
• docs/src/content/docs/reference/engines.md (line ~280 only — not the feature comparison table)

Acceptance Criteria

• All four engines (Copilot, Claude, Codex, Gemini) appear consistently wherever engine lists are shown
• README mentions supported engines in the at-a-glance/feature section
• No substantive content changes — these are additive fixes to omitted engine names only

Generated by Plan Command for issue #discussion #31206 · ● 4.4M · ◷

• expires on May 11, 2026, 1:00 PM UTC

[github-actions]

🍪 Issue Monster selected this for Copilot

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[github-actions]

This issue was automatically closed because it expired on 2026-05-11T13:00:16.561Z.

Closed by Workflow