feat(claude-code): add initial plugin implementation with aliases, helpers, and tab completion

plugins/claude-code/README.md

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+# Claude Code Plugin
+
+The `claude-code` plugin adds several aliases and helper functions for [Claude Code](https://github.com/anthropics/claude-code), the CLI for Claude.
+
+To use it, add `claude-code` to the plugins array of your zshrc file:
+
+```zsh
+plugins=(... claude-code)
+```
+
+## Aliases
+
+### Core
+
+| Alias | Command | Description |
+|-------|---------|-------------|
+| `cl` | `claude` | Start interactive session |
+| `clc` | `claude --continue` | Continue last conversation |
+| `clr` | `claude --resume` | Open session picker |
+| `clp` | `claude -p` | Headless/print mode |
+| `clv` | `claude --version` | Show version |
+| `clu` | `claude update` | Update Claude Code |
+
+### Sessions
+
+| Alias | Command | Description |
+|-------|---------|-------------|
+| `cln` | `claude -n` | Start a named session |
+| `clw` | `claude -w` | Start in a git worktree |
+| `clfork` | `claude --fork-session` | Fork current session |
+
+### Auth
+
+| Alias | Command | Description |
+|-------|---------|-------------|
+| `clas` | `claude auth status` | Check auth status |
+| `clal` | `claude auth login` | Sign in |
+| `clao` | `claude auth logout` | Sign out |
+
+### Config
+
+| Alias | Command | Description |
+|-------|---------|-------------|
+| `clmcp` | `claude mcp` | Manage MCP servers |
+| `clag` | `claude agents` | List configured agents |
+
+### Channels
+
+| Alias | Command | Description | Plugin Install |
+|-------|---------|-------------|----------------|
+| `clch-tg` | `claude --channels plugin:telegram@...` | Start with Telegram channel | `/plugin install telegram@claude-plugins-official` |
+| `clch-dc` | `claude --channels plugin:discord@...` | Start with Discord channel | `/plugin install discord@claude-plugins-official` |
+| `clch <spec>` | `claude --channels <spec>` | Start with custom channel | — |
+
+## Functions
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `clm <model>` | Start with a specific model | `clm opus` |
+| `cle <effort>` | Start with a specific effort level | `cle high` |
+| `clds` | Directory session — create/resume a session named after `$PWD` | `cd my-project && clds` |
+| `clfp <pr>` | Resume sessions linked to a GitHub PR | `clfp 123` |
+
+
+
+## Configuration Variables
+
+Set these in your `~/.zshrc` before the plugins line:
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `ZSH_CLAUDE_DEFAULT_MODEL` | (unset) | Default model for `clm` and `_claude_with_defaults` |
+| `ZSH_CLAUDE_DEFAULT_EFFORT` | (unset) | Default effort level |
+| `ZSH_CLAUDE_DEFAULT_PERMISSION_MODE` | (unset) | Default permission mode (plan/auto/manual) |
+| `ZSH_CLAUDE_AUTO_CONTINUE` | `false` | Auto-continue last session when opening a new shell |
+
+### Example configuration
+
+```zsh
+# ~/.zshrc
+ZSH_CLAUDE_DEFAULT_MODEL="sonnet"
+ZSH_CLAUDE_DEFAULT_EFFORT="high"
+ZSH_CLAUDE_AUTO_CONTINUE=false
+
+plugins=(... claude-code)
+```
+
+## Tab Completion
+
+- `clm [TAB]` — completes model names (opus, sonnet, haiku)
+- `cle [TAB]` — completes effort levels (low, medium, high, max)