fix(agents): ניתוב הערת-יו"ר לא ל-issue סגור (cancelled) — תמיד ל-CEO החי

בעיה חוזרת: הקלדת הוראה בתיבת "כתוב הוראה לסוכנים..." נבלעה בשקט. השרת בחר
את היעד ב-`active[-1]` תוך סינון `done` בלבד — לא `cancelled`. כשה-child האחרון
בוטל (למשל 1027-04-26: "חישוב טיעונים" cancelled שנוצר אחרי ה-issue הראשי),
ההערה נותבה אליו; Paperclip מדלג על wakeup ל-issue מבוטל → ההוראה לא הגיעה לאיש.

תיקון (G1 — נרמול במקור, לא תיקון-בקריאה):
- `pick_default_comment_target` חדש ב-paperclip_client — מעדיף את ה-issue הראשי
  החי של ה-CEO (top-level+open), נופל ל-open כלשהו, ואז top-level, ואף פעם לא
  מעדיף child-סגור. `get_case_issues` מחזיר כעת `parent_id`.
- app.py מנתב דרכו; מחזיר `issue_status` כדי שה-UI יוכל לסמן יעד-סגור.
- נחשף דרך ה-Port (G12) כ-`pc_pick_default_comment_target`.
- 6 בדיקות ל-picker (כולל תרחיש 1027-04-26 המדויק).

Invariants: G1 (נרמול-במקור), G2 (אין מסלול-ניתוב מקביל), G12 (מגע-Paperclip דרך ה-Port).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/tests/test_comment_target.py

@@ -0,0 +1,78 @@
+"""Tests for pick_default_comment_target — chair-comment routing.
+
+Regression guard for the recurring bug where a chair instruction typed into the
+"כתוב הוראה לסוכנים..." box was routed to a *cancelled* child issue, so
+Paperclip skipped the wakeup and the instruction was silently swallowed.
+
+The picker must never default to a closed (done/cancelled) issue and must prefer
+the live top-level CEO issue. Pure function — no DB, no FastAPI.
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+
+import pytest
+
+os.environ.setdefault("PAPERCLIP_DB_URL", "postgres://x:x@127.0.0.1:54329/paperclip")
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))  # web/
+
+pc = pytest.importorskip("paperclip_client", reason="web deps unavailable")
+
+
+def _iss(id_, status, parent_id=None):
+    return {"id": id_, "status": status, "parent_id": parent_id, "identifier": id_}
+
+
+def test_prefers_open_top_level_over_newer_cancelled_child():
+    """The exact 1027-04-26 scenario: newest non-done issue is a cancelled child;
+    routing must still land on the live top-level CEO issue."""
+    issues = [
+        _iss("main-old", "done"),                       # oldest top-level, closed
+        _iss("main-live", "in_review"),                 # live CEO main issue
+        _iss("child-cancelled", "cancelled", "main-live"),  # newest non-done → the trap
+        _iss("child-done", "done", "main-live"),
+    ]
+    assert pc.pick_default_comment_target(issues)["id"] == "main-live"
+
+
+def test_never_returns_cancelled_when_an_open_issue_exists():
+    issues = [
+        _iss("a", "done"),
+        _iss("b", "in_progress", "a"),
+        _iss("c", "cancelled", "a"),
+    ]
+    assert pc.pick_default_comment_target(issues)["status"] != "cancelled"
+
+
+def test_falls_back_to_open_child_when_no_open_top_level():
+    issues = [
+        _iss("main", "done"),
+        _iss("child-live", "in_progress", "main"),
+    ]
+    assert pc.pick_default_comment_target(issues)["id"] == "child-live"
+
+
+def test_prefers_top_level_when_everything_closed():
+    """No open issue anywhere — pick the newest top-level (better than a child)."""
+    issues = [
+        _iss("main-1", "done"),
+        _iss("main-2", "cancelled"),
+        _iss("child", "done", "main-2"),
+    ]
+    assert pc.pick_default_comment_target(issues)["id"] == "main-2"
+
+
+def test_single_issue():
+    issues = [_iss("only", "cancelled")]
+    assert pc.pick_default_comment_target(issues)["id"] == "only"
+
+
+def test_picks_newest_open_top_level():
+    issues = [
+        _iss("main-1", "in_review"),
+        _iss("main-2", "in_review"),
+    ]
+    assert pc.pick_default_comment_target(issues)["id"] == "main-2"