docs: stop naming the middleware

An agent talks to URLs that honour a contract: an MCP endpoint, an OIDC token
endpoint, an OpenAI-shaped LLM endpoint. Whatever serves those URLs is
replaceable, and naming it in an agent's code or docs implies a coupling that
does not exist.

Every product name is gone from prose, comments and identifiers, replaced by
what the agent actually depends on. Where a behaviour of the current middleware
leaks into the contract — the second audience scope, the tool ACL — the text
now says what the caller must do and why, not who imposes it.

One string survives and cannot be fixed here: the broker client an agent must
name in its audience scopes is itself named after the middleware. Closing that
means renaming it in Keycloak and following the rename through the gateway
configuration and LibreChat. Recorded as a blocker.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

dev/bootstrap-kustomization.yaml

@@ -1,7 +1,7 @@
 # Watches ./dev, so the GitRepository and the Kustomization below it reconcile
 # from git like any other manifest. It lives in ./dev itself, so it also manages
 # itself — the arrangement `flux bootstrap` sets up, which flux-operator does
-# not create, and the same one every kong-* repo now uses.
+# not create, and the same one the platform repos use.
 #
 # It sits in the agents namespace, not flux-system: a sourceRef resolves in the
 # Kustomization's own namespace, and this is the agent team's to own.