Implement a plugin as alternative for deprecated Explanatory output style

plugins/explanatory-output-style/README.md

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+# Explanatory Output Style Plugin
+
+This plugin recreates the deprecated Explanatory output style as a SessionStart hook.
+
+## What it does
+
+When enabled, this plugin automatically adds instructions at the start of each session that encourage Claude to:
+
+1. Provide educational insights about implementation choices
+2. Explain codebase patterns and decisions
+3. Balance task completion with learning opportunities
+
+## How it works
+
+The plugin uses a SessionStart hook to inject additional context into every session. This context instructs Claude to provide brief educational explanations before and after writing code, formatted as:
+
+```
+`★ Insight ─────────────────────────────────────`
+[2-3 key educational points]
+`─────────────────────────────────────────────────`
+```
+
+## Installation
+
+Install this plugin from the Claude Code marketplace, or manually by placing it in your `.claude/plugins` directory.
+
+## Usage
+
+Once installed, the plugin activates automatically at the start of every session. No additional configuration is needed.
+
+The insights focus on:
+- Specific implementation choices for your codebase
+- Patterns and conventions in your code
+- Trade-offs and design decisions
+- Codebase-specific details rather than general programming concepts
+
+## Migration from Output Styles
+
+This plugin replaces the deprecated "Explanatory" output style setting. If you previously used:
+
+```json
+{
+  "outputStyle": "Explanatory"
+}
+```
+
+You can now achieve the same behavior by installing this plugin instead.
+
+## Managing changes
+
+* Disable the plugin - keep the code installed on your device
+* Uninstall the plugin - remove the code from your device
+* Update the plugin - create a local copy of this plugin to personalize this plugin
+    - Hint: Ask Claude to read https://docs.claude.com/en/docs/claude-code/plugins.md and set it up for you!
+
+