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/mcp/tools/repos.py

@@ -22,8 +22,8 @@ async def bind_repo(repo_url: str, project_id: int, ref: str = "") -> dict:
 
     The binding is also what the shape ledger reads (refresh_pattern_coverage):
     `ref` names the branch it follows. Default (""): the repo's default branch
-    — which means the ledger only sees work after a merge. A dev-first project
-    (rule 1: dev is home) should bind with ref="dev" so classification follows
+    — which means the ledger only sees work after a merge. A project that
+    works on a dev branch should bind with ref="dev" so classification follows
     the push, not the merge. Re-binding with ref="" keeps the standing ref;
     pass ref="-" to clear it back to the default branch.