feat(everything): add AI prompt plugin (Claude + Ollama)

Adds a new Everything launcher plugin triggered by '?' that sends
the query to either Claude API or a local Ollama instance and
displays the response as a selectable item.

Configure via environment variables:
  ANTHROPIC_API_KEY  enables Claude (auto-detected)
  AI_PROVIDER        "claude" or "ollama" (default: auto)
  CLAUDE_MODEL       default: claude-haiku-4-5-20251001
  OLLAMA_MODEL       default: llama3.2
  OLLAMA_HOST        default: http://localhost:11434

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# Enlightenment AI Prompt Plugin
+
+An AI agent prompt plugin for the [Enlightenment](https://www.enlightenment.org/) Everything launcher.
+
+## Usage
+
+Open the Everything launcher and type `?` followed by your question:
+
+```
+?what is the capital of France
+```
+
+The plugin shows **Asking AI...** while waiting, then updates the item with the AI response. Select the item to copy it to clipboard.
+
+## Supported backends
+
+- **Claude** (Anthropic API) — set `ANTHROPIC_API_KEY` in your environment
+- **Ollama** (local LLM) — runs against `http://localhost:11434` by default
+
+Backend is auto-detected: Claude is used when `ANTHROPIC_API_KEY` is set, otherwise Ollama is assumed.
+
+## Configuration
+
+Set these environment variables (e.g. in `~/.profile`):
+
+| Variable | Default | Description |
+|---|---|---|
+| `ANTHROPIC_API_KEY` | — | Anthropic API key; enables Claude when set |
+| `AI_PROVIDER` | auto | Force `"claude"` or `"ollama"` |
+| `CLAUDE_MODEL` | `claude-haiku-4-5-20251001` | Claude model to use |
+| `OLLAMA_MODEL` | `llama3.2` | Ollama model to use |
+| `OLLAMA_HOST` | `http://localhost:11434` | Ollama server base URL |
+
+## Applying to your Enlightenment source tree
+
+This repo mirrors the directory structure of the Enlightenment source tree. Copy the files into `src/modules/everything/` in your Enlightenment checkout.
+
+**Files changed:**
+
+| File | Change |
+|---|---|
+| `src/modules/everything/evry_plug_ai.c` | New plugin (the main implementation) |
+| `src/modules/everything/e_mod_main.h` | Added `evry_plug_ai_init/shutdown/save` declarations |
+| `src/modules/everything/e_mod_main.c` | Added `evry_plug_ai_init(m)` and `evry_plug_ai_shutdown()` calls |
+| `src/modules/everything/meson.build` | Added `evry_plug_ai.c` to the source list |
+
+Then rebuild with meson/ninja.
+
+## Requirements
+
+- `curl` must be available in `PATH` (used to call the AI APIs)
+- Enlightenment with the Everything module enabled