feat: support parallel loops with per-project tmux session names

The tmux session name is now derived from the project directory name
(e.g., agent-loop-server, agent-loop-webapp). This allows running
multiple loops in parallel on different projects without collisions.

Previously hardcoded to "agent-loop", which meant launching a second
loop would kill the first project's tmux session.

.claude-plugin/marketplace.json

@@ -10,7 +10,7 @@
       "name": "agent-loop",
       "source": "./",
       "description": "Autonomous generator-evaluator agent loop for long-running coding tasks. Plan interactively, then execute with full visibility.",
-      "version": "0.10.2",
+      "version": "0.11.0",
       "author": {
         "name": "Sheldon"
       },

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "agent-loop",
-  "version": "0.10.2",
+  "version": "0.11.0",
   "description": "Autonomous generator-evaluator agent loop for long-running coding tasks. Run /agent-loop:run to start.",
   "author": {
     "name": "Sheldon"