fix: thread caller pane ID for cross-instance session isolation

bin/ask

@@ -96,6 +96,17 @@ CALLER_ENV_HINTS = {
 VALID_CALLERS = set(CALLER_SESSION_FILES.keys()) | {"email", "manual"}
 
 
+def _caller_pane_info() -> tuple[str, str]:
+    """Return (pane_id, terminal_type) from the current environment."""
+    wez = (os.environ.get("WEZTERM_PANE") or "").strip()
+    if wez:
+        return wez, "wezterm"
+    tmux = (os.environ.get("TMUX_PANE") or "").strip()
+    if tmux:
+        return tmux, "tmux"
+    return "", ""
+
+
 def _env_int(name: str, default: int) -> int:
     raw = (os.environ.get(name) or "").strip()
     if not raw:
@@ -335,6 +346,8 @@ def _send_via_unified_daemon(
         print("[ERROR] Invalid askd state", file=sys.stderr)
         return EXIT_ERROR
 
+    caller_pane_id, caller_terminal = _caller_pane_info()
+
     req = {
         "type": "ask.request",
         "v": 1,
@@ -346,6 +359,8 @@ def _send_via_unified_daemon(
         "message": message,
         "no_wrap": no_wrap,
         "caller": caller,
+        "caller_pane_id": caller_pane_id,
+        "caller_terminal": caller_terminal,
     }
 
     # Pass email-related env vars for email caller
@@ -670,6 +685,13 @@ def main(argv: list[str]) -> int:
                 if val:
                     email_env_lines += f'$env:{key} = "{val}"\n'
 
+        win_caller_pane_id, win_caller_terminal = _caller_pane_info()
+        win_pane_env_lines = ""
+        if win_caller_pane_id:
+            win_pane_env_lines += f'$env:CCB_CALLER_PANE_ID = "{win_caller_pane_id}"\n'
+        if win_caller_terminal:
+            win_pane_env_lines += f'$env:CCB_CALLER_TERMINAL = "{win_caller_terminal}"\n'
+
         script_content = f'''$ErrorActionPreference = "SilentlyContinue"
 $OutputEncoding = [System.Text.Encoding]::UTF8
 [Console]::OutputEncoding = [System.Text.Encoding]::UTF8
@@ -678,7 +700,7 @@ $env:PYTHONIOENCODING = "utf-8"
 $env:CCB_REQ_ID = "{task_id}"
 $env:CCB_CALLER = "{caller}"
 $env:CCB_WORK_DIR = "{os.getcwd()}"
-{run_dir_line}{email_env_lines}$statusFile = "{status_file_win}"
+{run_dir_line}{email_env_lines}{win_pane_env_lines}$statusFile = "{status_file_win}"
 $logFile = "{log_file_win}"
 function Write-CcbStatus([string]$line) {{
   Add-Content -Path $statusFile -Value ("{{0}} {{1}}" -f (Get-Date -Format "yyyy-MM-ddTHH:mm:sszzz"), $line) -Encoding UTF8
@@ -717,6 +739,13 @@ exit $rc
         ccb_run_dir = os.environ.get("CCB_RUN_DIR", "")
         run_dir_line = f'export CCB_RUN_DIR="{ccb_run_dir}"\n' if ccb_run_dir else ""
 
+        bg_pane_id, bg_terminal = _caller_pane_info()
+        pane_env_lines = ""
+        if bg_pane_id:
+            pane_env_lines += f'export CCB_CALLER_PANE_ID="{bg_pane_id}"\n'
+        if bg_terminal:
+            pane_env_lines += f'export CCB_CALLER_TERMINAL="{bg_terminal}"\n'
+
         quoted_status = shlex.quote(str(status_file))
         quoted_ask_cmd = shlex.quote(ask_cmd)
         quoted_provider = shlex.quote(provider)
@@ -730,7 +759,7 @@ echo "[CCB_TASK_START] task={task_id} provider={provider} caller={caller} pid=$$
 export CCB_REQ_ID="{task_id}"
 export CCB_CALLER="{caller}"
 export CCB_WORK_DIR="{os.getcwd()}"
-{run_dir_line}{email_env_lines}python3 {quoted_ask_cmd} {quoted_provider} --foreground --timeout {timeout} <<'ASKEOF'
+{run_dir_line}{email_env_lines}{pane_env_lines}python3 {quoted_ask_cmd} {quoted_provider} --foreground --timeout {timeout} <<'ASKEOF'
 {message}
 ASKEOF
 rc=$?