Add configurable worktree target path and session run diagnostics

.env.example

@@ -32,6 +32,8 @@ AGENT_RELATIONSHIP_MAX_CHILDREN=4
 # Resource provisioning (hard + soft constraints)
 AGENT_WORKTREE_ROOT=.ai_ops/worktrees
 AGENT_WORKTREE_BASE_REF=HEAD
+# Optional relative path inside each worktree; enables sparse-checkout and sets working directory there.
+AGENT_WORKTREE_TARGET_PATH=
 AGENT_PORT_BASE=36000
 AGENT_PORT_BLOCK_SIZE=32
 AGENT_PORT_BLOCK_COUNT=512