wip(394): steps 6+7 — backend path and instruction surfaces

src/scribe/routes/plugin.py

@@ -202,11 +202,6 @@ async def write_path_prior_art():
                              or `canon:<snippet_id>`) already named this
                              session by the ledger arm (#2900); its own
                              channel, like the two above.
-        rules_etag (opt)   — the marker the session was given when it loaded
-                             its always-on rules (milestone 323). Sent back
-                             so the server can say whether those rules have
-                             MOVED since. Absent means the hook has nothing
-                             stored, which is silence, not a mismatch.
         shapes (opt)       — comma-separated `kind:name` definitions the hook
                              found in (or enclosing) the payload, kind being
                              css|sym. The shape ledger's write-path feed
@@ -226,7 +221,6 @@ async def write_path_prior_art():
         p.strip() for p in (request.args.get("exclude_derive") or "").split(",") if p.strip()
     ]
     exclude_rule_ids = _int_list(request.args.get("exclude_rule_ids"))
-    rules_etag = (request.args.get("rules_etag") or "").strip()
     shapes = _parse_shapes(request.args.get("shapes") or "")
     api_key = getattr(g, "api_key", None)
     may_stamp = api_key is None or getattr(api_key, "scope", "") == "write"
@@ -238,7 +232,6 @@ async def write_path_prior_art():
         repo_key=repo_bindings_svc.normalize_repo_key(repo) if repo else "",
         exclude_derive=exclude_derive,
         exclude_rule_ids=exclude_rule_ids,
-        rules_etag=rules_etag,
     )
     return jsonify(result)