Add Grok Bridge alpha for Codex, Claude Code, Cursor, and Antigravity

[niharnm]

Grok Bridge adds one shared CLI for bounded task handoffs between Grok Bot and Codex, Claude Code, Cursor, and Antigravity. It uses explicit destination and workspace selection, native session IDs, process limits, and correlated Bot replies. Host plugin packages and a canonical Agent Skill teach the same executable; there are no runtime npm dependencies.

The alpha has live evidence for Codex to Grok Bot, Grok Bot to Codex, and Grok Bot to Antigravity. Native Codex and Antigravity reads and edits also passed. Claude access, Cursor authentication, Antigravity source-host permissions, and host plugin discovery limit broader acceptance. The Grok transport depends on a community client and private gateway.

The public website at https://grok-bridge-henna.vercel.app/ supplies installation, route evidence, social metadata, a sitemap and a custom 404. The shared skill installs from the public repository. Four community directory PRs remain open, and IndexNow returned 202 pending ownership verification. Google Search Console ownership and sitemap processing are verified; a manual indexing request hit its daily quota. npm and vendor marketplace publication are not claimed; current distribution status is in docs/launch.md.

Validation: 90 tests, syntax/JSON checks, official plugin/skill validators, package inspection, public skill installation and byte comparison, and public HTTPS/browser checks. CI runs Node 22/24 on macOS/Linux. The acceptance record separates these checks from native integration. Website files and deployment metadata are excluded from the CLI package; the original alpha release archive remains unchanged.

This PR remains the review boundary between alpha and the initial main baseline. It is intentionally unmerged.

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