docs: the review classifier is live; drop 'planned, not implemented' from its index entries and its page

Two index entries (docs/README.md, docs/swarm/README.md) and the banner on
docs/swarm/review-classifier.md still said the classifier does not exist.

docs/swarm/README.md

@@ -28,8 +28,8 @@ grafana, the controller, authelia, …) →
 - **resource caps** — the CPU and memory cap the swarm sets for an agent,
   over its hive's. →
   [`coordinator.md`](../scheduler/coordinator.md#container-resource-limits)
-- **review classifier** — planned, not implemented yet: checks a PR against
-  its repo's own yes/no rules and posts the result as a review. →
+- **review classifier** — checks a PR against its repo's own yes/no rules
+  and posts the result as a review. →
   [`review-classifier.md`](review-classifier.md)
 - **notification router** — forge events turned into todos on the agents
   they concern: assigned, unassigned, cleared on close; and the classifier's

docs/swarm/review-classifier.md

@@ -1,11 +1,5 @@
 # Review classifier
 
-> ⚠️ **PLANNED, NOT IMPLEMENTED YET.** This page describes the full target
-> shape of the review classifier at component level, and none of it exists
-> in the tree today. The forge epic "pr review classifier pipeline" tracks
-> the work. Details land here as each part ships, and this banner goes away
-> when the epic closes.
-
 The review classifier checks a pull request against short, named yes/no
 rules that the repo itself defines, and posts the result as a forge review.
 A small model answers one rule at a time, so mundane rule checks come out