Update plugin install docs to use /add-plugin commands.

Replace legacy agent install snippets across plugin READMEs so docs reflect the current add-plugin workflow.

Co-authored-by: Cursor <cursoragent@cursor.com>

android/README.md

@@ -5,7 +5,7 @@ Android development: Kotlin, Jetpack Compose, architecture, and testing.
 ## Installation
 
 ```bash
-agent install android
+/add-plugin android
 ```
 
 ## Components

code-review/README.md

@@ -5,7 +5,7 @@ Code review workflows: correctness, security, regressions, and actionable feedba
 ## Installation
 
 ```bash
-agent install code-review
+/add-plugin code-review
 ```
 
 ## Components

create-plugin/README.md

@@ -5,7 +5,7 @@ Meta workflows for creating Cursor plugins that are marketplace-ready.
 ## Installation
 
 ```bash
-agent install create-plugin
+/add-plugin create-plugin
 ```
 
 ## Components

cursor-team-kit/README.md

@@ -5,7 +5,7 @@ Internal-style workflows for CI, code review, shipping, and test reliability.
 ## Installation
 
 ```bash
-agent install cursor-team-kit
+/add-plugin cursor-team-kit
 ```
 
 ## Components

data-science/README.md

@@ -5,7 +5,7 @@ Analyst-first data science: question framing, exploratory analysis, decision-rea
 ## Installation
 
 ```bash
-agent install data-science
+/add-plugin data-science
 ```
 
 ## Components

design/README.md

@@ -5,7 +5,7 @@ Product design: UX specs, design systems, handoff, and iteration.
 ## Installation
 
 ```bash
-agent install design
+/add-plugin design
 ```
 
 ## Components

documentation/README.md

@@ -5,7 +5,7 @@ Technical documentation: READMEs, API docs, architecture notes, and changelogs.
 ## Installation
 
 ```bash
-agent install documentation
+/add-plugin documentation
 ```
 
 ## Components

frontend/README.md

@@ -5,7 +5,7 @@ Frontend engineering: React, TypeScript, accessibility, and performance.
 ## Installation
 
 ```bash
-agent install frontend
+/add-plugin frontend
 ```
 
 ## Components

ios/README.md

@@ -5,7 +5,7 @@ iOS development: Swift, SwiftUI, architecture, and testing.
 ## Installation
 
 ```bash
-agent install ios
+/add-plugin ios
 ```
 
 ## Components

learning/README.md

@@ -5,7 +5,7 @@ Learning workflows: skill mapping, practice plans, and feedback loops.
 ## Installation
 
 ```bash
-agent install learning
+/add-plugin learning
 ```
 
 ## Components

planning/README.md

@@ -5,7 +5,7 @@ Software planning: scope, milestones, risk management, and execution plans.
 ## Installation
 
 ```bash
-agent install planning
+/add-plugin planning
 ```
 
 ## Components

ralph-loop/README.md

@@ -9,7 +9,7 @@ Two hooks drive the loop. An `afterAgentResponse` hook watches each response for
 ## Installation
 
 ```
-agent install ralph-loop
+/add-plugin ralph-loop
 ```
 
 ## Quick start

web-browser/README.md

@@ -9,7 +9,7 @@ This plugin requires MCP browser tools (`browser_navigate`, `browser_snapshot`,
 ## Installation
 
 ```bash
-agent install web-browser
+/add-plugin web-browser
 ```
 
 ## Components