refactor(scribe): retire calendar/events + person/place/list entities (backend)

Narrow Scribe to a Claude-Code work system-of-record (milestone #194,
decision note #1759). Wholesale removal per rule #22 — backend + schema half.

Calendar/events + CalDAV: delete models/event, services/{events,caldav,
caldav_sync}, routes/events, mcp/tools/events; strip event branches from
backup (bump v3->v4), dashboard (upcoming_events), trash, recent, and the
mcp server read-only allowlist + instructions.

Typed entities (person/place/list): delete mcp/tools/entities; drop the
notes.metadata (entity_meta) column from model/service/routes and the
knowledge browse service. note_type STAYS — it also marks 'process' notes.

Scheduler: event_scheduler -> recurrence_scheduler, keeping only the
recurring-task spawn job (drops event reminders + CalDAV sync).

Schema: migration 0069 drops the events table + notes.metadata column +
orphan caldav settings rows (faithful downgrade recreates them).

KEEP: recurrence.py (task recurrence), notifications task reminders, graph
view, and every work surface. Frontend + plugin/docs true-up follow next.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BPtbSzA4JLMAKgFZ8VTg7Q

src/scribe/services/dashboard.py

@@ -1,7 +1,7 @@
 """Dashboard aggregation — assembles the /dashboard landing payload.
 
 One call: most-recently-active projects (each -> active milestones -> open
-tasks), recently-completed tasks, upcoming events, week stats. Owner-scoped,
+tasks), recently-completed tasks, week stats. Owner-scoped,
 trashed rows excluded. Each section is independent — a failure returns its
 empty value rather than blanking the page.
 """
@@ -23,7 +23,7 @@ N_PROJECTS = 3        # most-recently-active projects shown
 TASKS_PER_GROUP = 5   # open-task cap per milestone / no-milestone group
 RECENT_DONE_LIMIT = 8 # recently-completed tasks shown
 OPEN_ISSUES_LIMIT = 10 # open issues shown on the dashboard
-WINDOW_DAYS = 7       # look-back (done) / look-ahead (events) window
+WINDOW_DAYS = 7       # look-back window (done items, week stats)
 _OPEN = ["todo", "in_progress"]
 
 
@@ -84,7 +84,6 @@ async def build_dashboard(user_id: int) -> dict:
     return {
         "active_projects": await _safe(_active_projects(user_id), []),
         "recently_completed": await _safe(_recently_completed(user_id), []),
-        "upcoming_events": await _safe(_upcoming_events(user_id), []),
         "open_issues": await _safe(_open_issues(user_id), []),
         "week_stats": await _safe(_week_stats(user_id), {}),
     }
@@ -177,18 +176,6 @@ async def _recently_completed(user_id: int) -> list[dict]:
                  "completed_at": n.completed_at.isoformat()} for n, ptitle in rows]
 
 
-async def _upcoming_events(user_id: int) -> list[dict]:
-    from scribe.services import events as events_svc
-    now = datetime.now(timezone.utc)
-    rows = await events_svc.list_events(user_id, now, now + timedelta(days=WINDOW_DAYS))
-    out = []
-    for e in rows:
-        d = e if isinstance(e, dict) else e.to_dict()
-        out.append({"id": d["id"], "title": d["title"],
-                    "start_dt": d.get("start_dt"), "all_day": d.get("all_day", False)})
-    return out
-
-
 async def _week_stats(user_id: int) -> dict:
     cutoff = datetime.now(timezone.utc) - timedelta(days=WINDOW_DAYS)
     async with async_session() as session: