fix(shared-dirs): add plugins directory to shared structure symlinks

Address PR #15 review comments by ensuring plugins directory is properly
handled in shared directory symlinking for both Bash and PowerShell
implementations. Adds plugins to directory creation and symlink loops.

Fixes:
- https://github.com/kaitranntt/ccs/pull/15#discussion_r2553557063
- https://github.com/kaitranntt/ccs/pull/15#discussion_r2553557078

lib/ccs

@@ -981,10 +981,10 @@ link_shared_directories() {
   local shared_dir="$HOME/.ccs/shared"
 
   # Ensure shared directories exist
-  mkdir -p "$shared_dir"/{commands,skills,agents}
+  mkdir -p "$shared_dir"/{commands,skills,agents,plugins}
 
   # Create symlinks (remove existing first if present)
-  for dir in commands skills agents; do
+  for dir in commands skills agents plugins; do
     local link_path="$instance_path/$dir"
     local target_path="$shared_dir/$dir"
 
@@ -1003,7 +1003,7 @@ migrate_to_shared_structure() {
   # Check if migration is needed (shared dirs exist but are empty)
   if [[ -d "$shared_dir" ]]; then
     local needs_migration=false
-    for dir in commands skills agents; do
+    for dir in commands skills agents plugins; do
       if [[ ! -d "$shared_dir/$dir" ]] || [[ -z "$(ls -A "$shared_dir/$dir" 2>/dev/null)" ]]; then
         needs_migration=true
         break
@@ -1014,7 +1014,7 @@ migrate_to_shared_structure() {
   fi
 
   # Create shared directory
-  mkdir -p "$shared_dir"/{commands,skills,agents}
+  mkdir -p "$shared_dir"/{commands,skills,agents,plugins}
 
   # Copy from ~/.claude/ (actual Claude CLI directory)
   local claude_dir="$HOME/.claude"
@@ -1031,6 +1031,10 @@ migrate_to_shared_structure() {
     # Copy agents to shared (if exists)
     [[ -d "$claude_dir/agents" ]] && \
       cp -r "$claude_dir/agents"/* "$shared_dir/agents/" 2>/dev/null || true
+
+    # Copy plugins to shared (if exists)
+    [[ -d "$claude_dir/plugins" ]] && \
+      cp -r "$claude_dir/plugins"/* "$shared_dir/plugins/" 2>/dev/null || true
   fi
 
   # Update all instances to use symlinks

lib/ccs.ps1

@@ -659,7 +659,7 @@ function Link-SharedDirectories {
     $SharedDir = "$env:USERPROFILE\.ccs\shared"
 
     # Ensure shared directories exist
-    @('commands', 'skills', 'agents') | ForEach-Object {
+    @('commands', 'skills', 'agents', 'plugins') | ForEach-Object {
         $Dir = Join-Path $SharedDir $_
         if (-not (Test-Path $Dir)) {
             New-Item -ItemType Directory -Path $Dir -Force | Out-Null
@@ -667,7 +667,7 @@ function Link-SharedDirectories {
     }
 
     # Create symlinks (requires Windows Developer Mode or admin)
-    @('commands', 'skills', 'agents') | ForEach-Object {
+    @('commands', 'skills', 'agents', 'plugins') | ForEach-Object {
         $LinkPath = Join-Path $InstancePath $_
         $TargetPath = Join-Path $SharedDir $_
 
@@ -693,7 +693,7 @@ function Migrate-SharedStructure {
     # Check if migration is needed (shared dirs exist but are empty)
     if (Test-Path $SharedDir) {
         $NeedsMigration = $false
-        foreach ($Dir in @('commands', 'skills', 'agents')) {
+        foreach ($Dir in @('commands', 'skills', 'agents', 'plugins')) {
             $DirPath = Join-Path $SharedDir $Dir
             if (-not (Test-Path $DirPath) -or (Get-ChildItem $DirPath -ErrorAction SilentlyContinue).Count -eq 0) {
                 $NeedsMigration = $true
@@ -705,7 +705,7 @@ function Migrate-SharedStructure {
     }
 
     # Create shared directory
-    @('commands', 'skills', 'agents') | ForEach-Object {
+    @('commands', 'skills', 'agents', 'plugins') | ForEach-Object {
         $Dir = Join-Path $SharedDir $_
         New-Item -ItemType Directory -Path $Dir -Force | Out-Null
     }
@@ -731,6 +731,12 @@ function Migrate-SharedStructure {
         if (Test-Path $AgentsPath) {
             Copy-Item "$AgentsPath\*" -Destination "$SharedDir\agents\" -Recurse -ErrorAction SilentlyContinue
         }
+
+        # Copy plugins to shared (if exists)
+        $PluginsPath = Join-Path $ClaudeDir "plugins"
+        if (Test-Path $PluginsPath) {
+            Copy-Item "$PluginsPath\*" -Destination "$SharedDir\plugins\" -Recurse -ErrorAction SilentlyContinue
+        }
     }
 
     # Update all instances to use symlinks