feat: Add PreTeleport and PostTeleport hook events

Add documentation and examples for new teleport hooks that allow users
to automate workflows when sessions transfer between web and CLI:

- PreTeleport: Runs before teleporting (stash work, sync state)
- PostTeleport: Runs after teleporting (pull changes, start dev servers)

This addresses the common workflow where users teleport from web to CLI
and need to run setup commands like `yarn dev:staging`.

Slack thread: https://anthropic.slack.com/archives/C096H3HP75G/p1765833639134099?thread_ts=1765833353.488839&cid=C096H3HP75G

plugins/plugin-dev/skills/hook-development/examples/pre-teleport.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+# Example PreTeleport hook for preparing environment before teleporting
+# This script stashes uncommitted changes and saves state for restoration
+
+set -euo pipefail
+
+# Navigate to project directory
+cd "$CLAUDE_PROJECT_DIR" || exit 0
+
+echo "Preparing for teleport..."
+
+# Check if we're in a git repository
+if [ ! -d ".git" ]; then
+  echo "Not a git repository, skipping pre-teleport preparation"
+  exit 0
+fi
+
+# Stash uncommitted changes before teleporting
+if [ -n "$(git status --porcelain)" ]; then
+  echo "📦 Stashing uncommitted changes before teleport..."
+  git stash push -m "pre-teleport-stash-$(date +%s)"
+  echo "Changes stashed successfully"
+else
+  echo "No uncommitted changes to stash"
+fi
+
+# Save current branch state for post-teleport restoration
+mkdir -p .claude
+echo "$(git branch --show-current)" > .claude/.teleport-state
+echo "Current branch saved: $(cat .claude/.teleport-state)"
+
+echo "Pre-teleport preparation complete"
+exit 0