Add aicoder user with opencode, Claude Code, and tmux

Dedicated aicoder user for AI coding tools. OpenCode and Claude Code
installed per-user, service runs from ~/codeprojects. Also fixes
forgejo-shell and SSH passthrough ordering in playbook.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

playbook.yml

@@ -354,14 +354,44 @@
         group: "{{ login_user }}"
         mode: '0644'
 
-    # --- OpenCode ---
+    # --- OpenCode / Claude Code ---
 
-    - name: Install opencode
+    - name: Create aicoder user
+      ansible.builtin.user:
+        name: aicoder
+        shell: /bin/bash
+        home: /home/aicoder
+        create_home: yes
+
+    - name: Create codeprojects directory
+      ansible.builtin.file:
+        path: /home/aicoder/codeprojects
+        state: directory
+        owner: aicoder
+        group: aicoder
+        mode: '0755'
+
+    - name: Install tmux
+      ansible.builtin.apt:
+        name: tmux
+        state: present
+
+    - name: Install opencode for aicoder
       ansible.builtin.shell:
         cmd: curl -fsSL https://opencode.ai/install | bash
       args:
-        creates: /home/{{ login_user }}/.opencode/bin/opencode
-      become_user: "{{ login_user }}"
+        creates: /home/aicoder/.opencode/bin/opencode
+      become_user: aicoder
+
+    - name: Install Claude Code for aicoder
+      ansible.builtin.shell:
+        cmd: npm install -g @anthropic-ai/claude-code
+      args:
+        creates: /home/aicoder/.npm-global/lib/node_modules/@anthropic-ai/claude-code
+      become_user: aicoder
+      environment:
+        NPM_CONFIG_PREFIX: /home/aicoder/.npm-global
+        PATH: "/home/aicoder/.npm-global/bin:{{ ansible_env.PATH }}"
 
     - name: Create opencode systemd service
       ansible.builtin.copy:
@@ -374,9 +404,9 @@
 
           [Service]
           Type=simple
-          User={{ login_user }}
-          WorkingDirectory=/home/{{ login_user }}
-          ExecStart=/home/{{ login_user }}/.opencode/bin/opencode serve --port 3000 --hostname 0.0.0.0
+          User=aicoder
+          WorkingDirectory=/home/aicoder/codeprojects
+          ExecStart=/home/aicoder/.opencode/bin/opencode serve --port 3000 --hostname 0.0.0.0
           Restart=on-failure
           RestartSec=5