chore: remove pre-pivot dead code + finish Scribe rebrand (#599 t1-3)

- Header wordmark Fabled -> Scribe; fable:calendar-changed event ->
  scribe:calendar-changed; SettingsView CSS comment.
- Drop dead Project.auto_summary + summary_updated_at columns (migration
  0063) -- the Ollama-era summarizer is gone; model + 2 frontend types +
  projects test updated.
- Remove pivot vestiges: diagnostics _curator_busy()/curator_busy
  heartbeat field, tz BRIEFING_DAY_START_HOUR/user_briefing_date dead
  aliases, the ignored 'model' param on get_embedding (+ its test).

ruff src/ clean; CI is the gate. Part of scribe plan #599.

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

src/scribe/models/project.py

@@ -1,6 +1,5 @@
 import enum
-from datetime import datetime
-from sqlalchemy import DateTime, ForeignKey, Integer, Text
+from sqlalchemy import ForeignKey, Integer, Text
 from sqlalchemy.orm import Mapped, mapped_column
 from scribe.models import Base
 from scribe.models.base import TimestampMixin, SoftDeleteMixin
@@ -22,10 +21,6 @@ class Project(Base, TimestampMixin, SoftDeleteMixin):
     goal: Mapped[str] = mapped_column(Text, default="")
     status: Mapped[str] = mapped_column(Text, default="active")
     color: Mapped[str | None] = mapped_column(Text, nullable=True)  # hex color
-    auto_summary: Mapped[str | None] = mapped_column(Text, nullable=True, default=None)
-    summary_updated_at: Mapped[datetime | None] = mapped_column(
-        DateTime(timezone=True), nullable=True, default=None
-    )
 
     def to_dict(self) -> dict:
         return {
@@ -36,7 +31,6 @@ class Project(Base, TimestampMixin, SoftDeleteMixin):
             "goal": self.goal,
             "status": self.status,
             "color": self.color,
-            "auto_summary": self.auto_summary,
             "created_at": self.created_at.isoformat(),
             "updated_at": self.updated_at.isoformat(),
         }

src/scribe/services/diagnostics.py

@@ -5,11 +5,10 @@ clear cause in the logs. This module adds three things designed to make
 the crash class identifiable from logs alone:
 
 1. **Heartbeat** — once per minute, log a snapshot of process resources
-   (RSS memory, asyncio task count, DB pool checked-in/out, curator
-   busy state). A sudden silence in heartbeats lets you bound the
-   crash time to within a minute, and the last snapshot before silence
-   usually rules in or out memory growth / pool exhaustion / hung
-   curator pass.
+   (RSS memory, asyncio task count, DB pool checked-in/out). A sudden
+   silence in heartbeats lets you bound the crash time to within a
+   minute, and the last snapshot before silence usually rules in or out
+   memory growth / pool exhaustion.
 
 2. **Signal handler** — catches SIGTERM and SIGINT, logs them with the
    sender's intent ("docker stop", "swarm restart", "manual ctrl-C")
@@ -108,11 +107,6 @@ def _asyncio_task_count() -> int | None:
         return None
 
 
-def _curator_busy() -> bool | None:
-    # Curator was removed in Phase 8 of the MCP-first pivot. Always False.
-    return False
-
-
 def _uptime_secs() -> float | None:
     if _started_at is None:
         return None
@@ -134,7 +128,6 @@ def _snapshot_dict(reason: str = "heartbeat") -> dict[str, Any]:
         "rss_mb": _process_rss_mb(),
         "asyncio_tasks": _asyncio_task_count(),
         "db_pool": _db_pool_stats(),
-        "curator_busy": _curator_busy(),
         "pid": os.getpid(),
     }
 
@@ -284,9 +277,9 @@ async def _heartbeat_loop() -> None:
             _persistent_log(
                 logging.INFO,
                 "diag heartbeat: uptime=%ss rss=%sMB asyncio_tasks=%s "
-                "db_pool=%s curator_busy=%s",
+                "db_pool=%s",
                 snap["uptime_secs"], snap["rss_mb"], snap["asyncio_tasks"],
-                snap["db_pool"], snap["curator_busy"],
+                snap["db_pool"],
             )
             _write_state_atomic(_CURRENT_STATE_PATH, snap)
         except Exception:

src/scribe/services/embeddings.py

@@ -53,12 +53,9 @@ async def _get_model():
     return _model
 
 
-async def get_embedding(text: str, model: str | None = None) -> list[float]:
+async def get_embedding(text: str) -> list[float]:
     """Get an embedding vector for the given text.
 
-    The ``model`` parameter is preserved for backward compatibility with the
-    Ollama era but is now ignored — fastembed uses a single fixed model.
-
     Raises if the fastembed model fails to load. Callers should catch and
     degrade to keyword search.
     """

src/scribe/services/tz.py

@@ -13,14 +13,11 @@ from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 from scribe.services.settings import get_setting
 
-# Day-rollover boundary for journal/day-anchored views. The "day" flips at
+# Day-rollover boundary for day-anchored "today" logic. The "day" flips at
 # this local hour (not midnight) so the 00:00–04:00 local window still
 # shows yesterday's content until the user "starts" the new day.
 DAY_ROLLOVER_HOUR = 4
 
-# Backwards-compat alias for code paths still referencing the old name.
-BRIEFING_DAY_START_HOUR = DAY_ROLLOVER_HOUR
-
 
 async def get_user_tz(user_id: int) -> ZoneInfo:
     """Return the user's IANA ``ZoneInfo``, falling back to UTC."""
@@ -41,12 +38,8 @@ async def user_day_date(user_id: int) -> date:
     """Return the current "day" in the user's local timezone.
 
     The day flips at ``DAY_ROLLOVER_HOUR`` (4am local) rather than midnight,
-    so the 00:00–04:00 local window still returns *yesterday* — the user's
-    journal stays anchored to yesterday until they cross the rollover.
+    so the 00:00–04:00 local window still returns *yesterday* — a day-anchored
+    view stays on yesterday until the user crosses the rollover.
     """
     tz = await get_user_tz(user_id)
     return (datetime.now(tz) - timedelta(hours=DAY_ROLLOVER_HOUR)).date()
-
-
-# Backwards-compat alias used by briefing-only modules being torn down in Stage B.
-user_briefing_date = user_day_date