refactor: unify env vars (UWF_HOME, OCAS_HOME) + env only in CLI (#37)

Breaking changes:
- UWF_STORAGE_ROOT → UWF_HOME
- WORKFLOW_STORAGE_ROOT removed (no fallback)
- OCAS_DIR → OCAS_HOME (aligned with ocas CLI)

Library functions no longer read process.env:
- util-agent/storage.ts: resolveStorageRoot(override), getGlobalCasDir(override)
- agent-hermes: isResumeDisabled(flag) pure function, CLI reads env
- agent-claude-code: CLI reads CLAUDE_MODEL and passes to agent

Fixes #37

scripts/check-dev-env.sh

@@ -89,7 +89,7 @@ echo ""
 echo "=== Config ==="
 
 # Check workflow config exists
-CONFIG_DIR="${UWF_STORAGE_ROOT:-$HOME/.shazhou/united-workforce}"
+CONFIG_DIR="${UWF_HOME:-$HOME/.shazhou/united-workforce}"
 check "config.yaml exists" \
   "[ -f '$CONFIG_DIR/config.yaml' ]" \
   "Run: uwf setup"

scripts/e2e-walkthrough.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # E2E walkthrough for shazhou/united-workforce.
-# Runs inside Docker with isolated UWF_STORAGE_ROOT.
+# Runs inside Docker with isolated UWF_HOME.
 # Exercises: setup → workflow add → thread start/exec → cancel/fork → read/inspect.
 #
 # Usage:
@@ -70,8 +70,8 @@ cat > "$E2E_DIR/run.sh" << 'INNER_SCRIPT'
 set -euo pipefail
 
 # Isolated storage — never touches host's ~/.uwf
-export UWF_STORAGE_ROOT="/tmp/uwf-e2e-storage"
-mkdir -p "$UWF_STORAGE_ROOT"
+export UWF_HOME="/tmp/uwf-e2e-storage"
+mkdir -p "$UWF_HOME"
 
 REPO_DIR="$1"
 AGENT="$2"
@@ -157,7 +157,7 @@ if [ -n "$PROVIDER" ] && [ -n "$MODEL" ] && [ -n "$API_KEY" ]; then
 else
   # Copy host config if available
   if [ -f "$HOME/.shazhou/united-workforce/config.yaml" ]; then
-    cp "$HOME/.shazhou/united-workforce/config.yaml" "$UWF_STORAGE_ROOT/config.yaml"
+    cp "$HOME/.shazhou/united-workforce/config.yaml" "$UWF_HOME/config.yaml"
     echo "  Copied host config.yaml" >&2
   fi
 fi