Rename plugin from claude-preview to code-preview (backend-agnostic)

[Cannon07]

Why

• Plugin now supports multiple backends (Claude Code, OpenCode) as of v1.1.0
• More backends planned (Copilot CLI, Codex, Gemini CLI)
• Current name implies Claude-only, which is misleading
• Better to rename now than later with a larger user base

What needs to change

Lua module namespace

• require("claude-preview") → require("code-preview")
• require("claude-preview.diff") → require("code-preview.diff"), etc.
• Directory: lua/claude-preview/ → lua/code-preview/

User commands

Current	New
:ClaudePreviewInstallHooks	:CodePreviewInstallClaudeCodeHooks
:ClaudePreviewUninstallHooks	:CodePreviewUninstallClaudeCodeHooks
:ClaudePreviewCloseDiff	:CodePreviewCloseDiff
:ClaudePreviewStatus	:CodePreviewStatus
:CodePreviewInstallOpenCodeHooks	:CodePreviewInstallOpenCodeHooks (unchanged)
:CodePreviewUninstallOpenCodeHooks	:CodePreviewUninstallOpenCodeHooks (unchanged)

Shell scripts in bin/

• claude-preview-diff.sh → code-preview-diff.sh
• claude-close-diff.sh → code-close-diff.sh

Other

• Highlight groups (ClaudePreview* → CodePreview*)
• Keymap descriptions
• Hook references in .claude/settings.local.json (paths change)
• OpenCode plugin internal references
• README, docs, health check text
• Repository name (claude-preview.nvim → code-preview.nvim)

Migration plan

• Keep old commands as deprecated aliases for one release
• GitHub repo redirect happens automatically on rename
• Document migration steps in release notes
• Users need to:
  • Update require("claude-preview") → require("code-preview") in their nvim config
  • Re-run install hooks command (hook script paths change)

Notes

• v1.1.0 has been tagged as the last release under the claude-preview name — users can pin to this if they need time to migrate
• Rename will be announced separately with clear upgrade instructions

[Cannon07]

Completed in #34 and #35, shipped in v2.0.0.