examples: add shell wrapper to fix --resume cwd mismatch

examples/resume-cwd-wrapper.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env zsh
+# resume-cwd-wrapper.sh
+#
+# Workaround for https://github.com/anthropics/claude-code/issues/43202
+#
+# PROBLEM
+# -------
+# Sessions are stored at ~/.claude/projects/<ENCODED_CWD>/<session-id>.jsonl
+# where ENCODED_CWD is the working directory at session start, with '/' replaced by '-'.
+#
+# When `claude --resume <id>` is called from a different directory (e.g. after
+# a rename, or opening a new shell), Claude looks in the *current* directory's
+# project folder, doesn't find the session, falls into the web-session code
+# path, and throws a misleading authentication error instead of "session not found".
+#
+# FIX
+# ---
+# This shell function wraps the `claude` binary so that before resuming it:
+#   1. Searches ~/.claude/projects/ across ALL project dirs for <session-id>.jsonl
+#   2. Reads the original `cwd` recorded in the session's first JSONL entry
+#   3. cd's to that directory so the project-path lookup succeeds
+#
+# USAGE
+# -----
+# Source this file in your shell config (~/.zshrc or ~/.bashrc):
+#
+#   source /path/to/resume-cwd-wrapper.sh
+#
+# Then use `claude --resume` as normal.
+
+function claude() {
+  local resume_idx=-1
+  local session_id=""
+
+  for i in {1..${#@}}; do
+    local arg="${@[$i]}"
+    if [[ "$arg" == "--resume" || "$arg" == "-r" ]]; then
+      resume_idx=$i
+      local next_idx=$((i + 1))
+      if [[ $next_idx -le ${#@} && "${@[$next_idx]}" != -* ]]; then
+        session_id="${@[$next_idx]}"
+      fi
+      break
+    fi
+  done
+
+  if [[ -n "$session_id" ]]; then
+    local session_file
+    session_file=$(find ~/.claude/projects -name "${session_id}.jsonl" 2>/dev/null | head -1)
+
+    if [[ -n "$session_file" ]]; then
+      local session_cwd
+      session_cwd=$(python3 - "$session_file" <<'EOF'
+import json, sys
+with open(sys.argv[1]) as f:
+    for line in f:
+        try:
+            data = json.loads(line)
+            if 'cwd' in data:
+                print(data['cwd'])
+                break
+        except Exception:
+            pass
+EOF
+)
+      if [[ -n "$session_cwd" && -d "$session_cwd" && "$session_cwd" != "$PWD" ]]; then
+        echo "claude: resuming session from $session_cwd" >&2
+        cd "$session_cwd"
+      elif [[ -n "$session_cwd" && ! -d "$session_cwd" ]]; then
+        echo "claude: warning: original session directory '$session_cwd' no longer exists" >&2
+      fi
+    fi
+  fi
+
+  command claude "$@"
+}