fix(post-update): clear Claude plugin cache on update

The Claude plugin cache at ~/.claude/plugins/cache/leo-claude-mktplace/
holds versioned copies of .mcp.json files. When we update .mcp.json
to use run.sh instead of direct python paths, the cache retains old
versions, causing MCP servers to fail.

Now post-update.sh clears this cache, forcing Claude to read fresh
configs from the installed marketplace on next session start.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/post-update.sh

@@ -5,13 +5,16 @@
 # Usage: ./scripts/post-update.sh
 #
 # This script:
-# 1. Restores MCP venv symlinks (instant if cache exists)
-# 2. Creates venvs in external cache if missing (first run only)
-# 3. Shows recent changelog updates
+# 1. Clears Claude plugin cache (forces fresh .mcp.json reads)
+# 2. Restores MCP venv symlinks (instant if cache exists)
+# 3. Creates venvs in external cache if missing (first run only)
+# 4. Shows recent changelog updates
 #
 
 set -euo pipefail
 
+CLAUDE_PLUGIN_CACHE="$HOME/.claude/plugins/cache/leo-claude-mktplace"
+
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 REPO_ROOT="$(dirname "$SCRIPT_DIR")"
 
@@ -47,6 +50,14 @@ main() {
     echo "=============================================="
     echo ""
 
+    # Clear Claude plugin cache to force fresh .mcp.json reads
+    # This cache holds versioned copies that become stale after updates
+    if [[ -d "$CLAUDE_PLUGIN_CACHE" ]]; then
+        log_info "Clearing Claude plugin cache..."
+        rm -rf "$CLAUDE_PLUGIN_CACHE"
+        log_success "Plugin cache cleared"
+    fi
+
     # Run venv-repair.sh to restore symlinks to external cache
     # This is instant if cache exists, or does full setup on first run
     if [[ -x "$SCRIPT_DIR/venv-repair.sh" ]]; then
@@ -68,6 +79,7 @@ main() {
     echo ""
     log_success "Post-update complete!"
     echo ""
+    echo "IMPORTANT: Restart Claude Code for changes to take effect."
     echo "MCP servers will work immediately on next session start."
 }