docs(6206): the remaining models, routes, mcp/tools/repos and config comments drop citations

A shipped tool docstring (mcp/tools/repos bind_repo) cited this instance's
"rule 1: dev is home"; it now says what a dev-branch project should do.
routes/knowledge, routes/tasks, routes/systems and models/retrieval_log state
the property each guards rather than the bug that once broke it.

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

src/scribe/models/design_system.py

@@ -135,7 +135,7 @@ class DesignToken(Base, TimestampMixin, SoftDeleteMixin):
     # and the token's own value are usually different colours entirely. No
     # value-matching rule could ever connect them.
     #
-    # Consumed by the source lint (#2277), not by the drift panel: these
+    # Consumed by the source lint, not by the drift panel: these
     # literals live in component CSS, which the panel cannot see and says so.
     supersedes: Mapped[list] = mapped_column(
         JSONB, nullable=False, default=list, server_default=text("'[]'::jsonb")