Add plan-auto-show plugin to display plan after updates

When in plan mode, users couldn't see the plan without typing /plan,
but they also couldn't type /plan while being asked follow-up questions.

This plugin adds a SessionStart hook that instructs Claude to
automatically display the plan content after updating the plan file,
showing it before any follow-up questions.

Fixes the UX issue where users need to answer questions about a plan
they can't see.

plugins/plan-auto-show/README.md

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+# Plan Auto-Show Plugin
+
+Automatically displays the plan content when it's updated in plan mode, eliminating the need to type `/plan` to preview changes.
+
+## Problem
+
+When in plan mode, Claude updates the plan file and may ask follow-up questions. Users can't see the plan without typing `/plan`, but they also can't type `/plan` while being asked questions - they need to respond to the questions first.
+
+## Solution
+
+This plugin instructs Claude to automatically display the plan content in its response whenever it updates the plan file. The plan is shown before any follow-up questions, giving users the context they need to answer.
+
+## Installation
+
+1. Enable the plugin in your Claude Code settings
+2. The SessionStart hook will automatically add instructions for plan auto-display
+
+## How It Works
+
+The plugin adds a SessionStart hook that provides additional context to Claude:
+- After updating the plan file, Claude will display the full plan content
+- The plan is shown in a markdown code block
+- The plan appears before any follow-up questions
+
+## Example
+
+Before this plugin:
+```
+Claude: I've updated the plan file. Would you prefer approach A or B?
+User: (Can't see the plan without typing /plan, but needs to answer the question)
+```
+
+After this plugin:
+```
+Claude: I've updated the plan file:
+
+## Current Plan
+1. Implement feature X
+2. Add tests
+3. Deploy
+
+Would you prefer approach A or B?
+
+User: (Can see the plan and answer the question)
+```