W-23057147: Skills and MCP support for Gemini, Antigravity, and Copilot CLI

[amit-kumar8-sf]

Extend agent-skill installation and the b2c-dx-mcp MCP server to Gemini and Google Antigravity, and round out the VS Code onboarding walkthrough so it can set up skills + MCP for every supported AI tool (including GitHub Copilot CLI).

SDK / CLI

• Add gemini-cli and antigravity to the IdeType registry (IDE_CONFIGS, ALL_IDE_TYPES) with their skill install paths:
  gemini-cli project .gemini/skills global ~/.gemini/skills
  antigravity project .agents/skills global ~/.gemini/config/skills
• b2c setup skills now accepts --ide gemini-cli and --ide antigravity; the flag
  options derive from ALL_IDE_TYPES so the list stays in sync automatically.

Gemini CLI extension

• gemini-extension.json + GEMINI.md bundle the b2c-dx-mcp MCP server and B2C project context for gemini extensions install <repo>.
• scripts/sync-plugin-versions.mjs pins the extension to the current @salesforce/b2c-dx-mcp version.

VS Code walkthrough — "Set Up Agent Skills & MCP"

• Add Gemini CLI and Antigravity targets/icons.
• Add a dedicated GitHub Copilot CLI card that installs skills via the marketplace-plugin command (copilot plugin install), since copilot-cli is not a valid b2c setup skills --ide value. Its "Reinstall" uninstalls the plugins first, then reinstalls (uninstall -> install), and marketplace add is separated with ; (not &&) so an "already registered" marketplace does not abort the installs.
• Detect Copilot CLI skills via ~/.copilot/installed-plugins// (skillsMarkerDir), where copilot plugin install actually drops plugins, so the card correctly flips to "Skills installed".
• Detect the VS Code (Copilot Chat) card via the VS Code user-data dir instead of ~/.copilot, so it no longer collides with the Copilot CLI card.
• Add per-tool MCP-server detection (detectMcpStatus): parse each IDE's documented MCP config and match a real b2c-dx-mcp entry inside an mcpServers/servers container (a stray mention is not a false positive). Tools with no documented MCP path show "MCP · manual" linking the setup guide. The MCP action reads "Re-configure MCP" once a server is registered.
• Replace the single ambiguous "N skills installed" count with four labelled stats (tools supported · detected here · with skills · with MCP) and drop the redundant "Counts are per AI tool" legend; strengthen the ghost-button border.

VS Code walkthrough — "Install the B2C CLI"

• Render "Update CLI" as a disabled "Up to date" button when the installed CLI is confirmed current (b2cCliOutdated === false); keep it enabled + primary when a newer version exists, and enabled when the latest version can't be resolved (offline) so an unverified update isn't blocked.
• Surface the detected b2c-cli version in the green "Quick actions" chip (e.g. "b2c-cli v1.4.4") with a tooltip.
• Extract the action logic into a pure, exported buildInstallCliActions().

Docs

• Cover Gemini CLI, Gemini Code Assist, and Antigravity (IDE/CLI/SDK) in the agent-skills guide, CLI setup reference, and MCP installation guide, with explicit not-supported notes for the consumer Gemini and Microsoft Copilot desktop apps.

Chore

• Bump tsx catalog floor to ^4.22.0 to fix the Node >= 22 DEP0205 warning at its source (tsx switched to module.registerHooks); dev-only, dedupes esbuild.

Tests

• SDK registry/path coverage for the new IDEs; MCP schema-compat regression guard ensuring every array param emits an items definition (GitHub Copilot MCP requirement); VS-extension coverage for the Copilot CLI card invariant, the VS Code detection path change, the MCP detection matrix, the install-cli Update/version states, and the rendered summary counts + badges.

Summary

Brief description of what this PR does.

Testing

How was this tested?

Dependencies

• No net-new third-party dependencies were added
• If net-new third-party dependencies were added, rationale/discussion is included and 3pl-approved is set by a maintainer

---

• Tests pass (pnpm test)
• Code is formatted (pnpm run format)

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