feat(cli): pic routes ls --group + group-route journey + docs (§11 tail R5)

Visibility + end-to-end coverage + docs for group route templates.

- ApplyService::route_report(Group) → GET /api/v1/admin/groups/{id}/routes
  (viewer-tier GroupScriptsRead), surfacing a group's own route templates
  (method, host, path, handler script, dispatch, enabled).
- CLI: `pic routes ls --group <g>` (the script-id positional now conflicts
  with --group), client `group_routes_list` + RouteTemplateDto.
- Journey `group_routes.rs`: a group declares a `[[routes]]` template
  binding a group handler; a DESCENDANT app serves it (via `routes match`
  against the live RouteTable), a SIBLING-subtree app does not, `routes ls
  --group` shows it, re-apply is a NoOp. Shadowing + isolation are
  additionally pinned at the repo layer by group_route_templates.rs.
- Update the manifest unit test: a [group] now accepts route templates and
  rejects only the stateful trigger kinds.
- Docs: design §4.5 (the live route-template model + full-live
  invalidation + nearest-wins shadowing + deferrals), CLAUDE.md focus.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/manager-core/src/apply_api.rs

@@ -18,7 +18,8 @@ use serde_json::json;
 use crate::app_repo::AppRepository;
 use crate::apply_service::{
     ApplyError, ApplyOwner, ApplyReport, ApplyService, Bundle, BundleTrigger, CollectionInfo,
-    ExtensionPointInfo, NodeKind, PlanResult, TreeBundle, TreePlanResult, TriggerTemplateInfo,
+    ExtensionPointInfo, NodeKind, PlanResult, RouteTemplateInfo, TreeBundle, TreePlanResult,
+    TriggerTemplateInfo,
 };
 use crate::authz::{require, AuthzDenied, Capability};
 use crate::group_repo::GroupRepository;
@@ -42,9 +43,30 @@ pub fn apply_router(service: ApplyService) -> Router {
         )
         .route("/groups/{id}/collections", get(group_collections_handler))
         .route("/groups/{id}/triggers", get(group_triggers_handler))
+        .route("/groups/{id}/routes", get(group_routes_handler))
         .with_state(service)
 }
 
+/// Read-only §11 tail route-template report for a group: its own declared route
+/// templates (method, host, path, handler script, dispatch, enabled). Viewer-
+/// tier read. Backs `pic routes ls --group`.
+async fn group_routes_handler(
+    State(svc): State<ApplyService>,
+    Extension(principal): Extension<Principal>,
+    Path(id_or_slug): Path<String>,
+) -> Result<Json<Vec<RouteTemplateInfo>>, ApplyError> {
+    let group_id = resolve_group_id(svc.groups.as_ref(), &id_or_slug).await?;
+    require(
+        svc.authz.as_ref(),
+        &principal,
+        Capability::GroupScriptsRead(group_id),
+    )
+    .await
+    .map_err(map_authz)?;
+    let report = svc.route_report(ApplyOwner::Group(group_id)).await?;
+    Ok(Json(report))
+}
+
 /// Read-only §11 tail trigger-template report for a group: its own declared
 /// event trigger templates (kind, target, handler script, enabled). Viewer-tier
 /// read. Backs `pic triggers ls --group`.