feat(moments): a mount that keeps arriving where it does not apply proposes its own removal (milestone 458 step 7b, #4955)

The open-after-moment signal proposes a mount; nothing proposed taking one
off, so a wrong mount was noise at every occurrence until someone happened
to notice. rule_misfired(rule_id, moment, why, reached_by) records a report
against a MOUNTED pair, counted per distinct day (the MCP door carries no
session id) on a new rule_moment_judgments.misfire column (migration 0119,
backup v24). At three days the response carries a line asking the agent to
offer the operator the fix - reject takes the rule off, unmap_action stops
the action reaching the moment, confirm keeps the mount and stops the
asking - and Settings > Moments lists it as an unmount proposal with the
reasons and the actions that reached it. A re-mount clears the count.

Taught in moments.md, missed-retrieval.md and the reply hold's wording.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scribe/models/rule_moment_judgment.py

@@ -60,6 +60,11 @@ class RuleMomentJudgment(Base, CreatedAtMixin):
     note: Mapped[str | None] = mapped_column(Text, nullable=True)
     # The co-occurrence evidence (signal source), in lesson_rules' shape.
     evidence: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
+    # The other direction (step 7b, migration 0119): sessions saying this
+    # MOUNTED rule arrived at the moment and did not apply. lesson_rules'
+    # evidence shape keyed per day, plus the reasons given and the actions
+    # that reached the moment; `kept_at` once the operator kept the mount.
+    misfire: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
     judged_at: Mapped[datetime | None] = mapped_column(
         DateTime(timezone=True), nullable=True,
     )
@@ -76,6 +81,7 @@ class RuleMomentJudgment(Base, CreatedAtMixin):
             "source": self.source,
             "note": self.note or "",
             "evidence": self.evidence or {},
+            "misfire": self.misfire or {},
             "judged_at": iso(self.judged_at),
             "created_at": iso(self.created_at),
         }