fix(WP-0014/A2): close remaining pure-param and structural compilation errors

Convert all remaining `<- paramOrNothing / param / paramOrDefault /
currentUserOrNothing` monadic binds to `let` — these functions are pure
(ImplicitParams-based) in IHP v1.5, so `<-` is a type error in an IO
do-block.

Controllers fixed:
  AgentDelegations, AiGovernancePolicies, Annotations, ApiConsumers,
  CollectiveProposals, DecisionRecords, DeploymentRecords,
  HubCapabilityManifests, HubRoutingRules, InstitutionalKnowledge,
  OutcomeCorrelations, RequirementCandidates, TypeRegistries,
  WebhookSubscriptions, Widgets,
  Api/V2/{Annotations,InteractionEvents,Token}

WebhookSubscriptions: remove orphaned `Right () ->` case arm that was
left inside a bare `unless` block (structural parse error).

Also carries forward all in-progress fixes from the working tree:
  helpers (AgentBridge, ApiRateLimit, BottleneckDetector,
            CrossHubPropagation, FrictionScore),
  views (CanSelect instances, HSX lambda extraction, formFor wrappers),
  env/build (envrc GHCi perms, flake.nix Tailwind + GHC resource limits,
             static/app.css additional Tailwind output).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Web/View/Annotations/Index.hs

@@ -5,6 +5,7 @@ import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
 import Web.Routes ()
+import Data.Coerce (coerce)
 
 data IndexView = IndexView
     { widget      :: !Widget
@@ -14,7 +15,7 @@ data IndexView = IndexView
 instance View IndexView where
     html IndexView { .. } =
         let rootAnnotations = filter (\a -> isNothing a.parentId) annotations
-            childrenOf parent = filter (\a -> a.parentId == Just parent.id) annotations
+            childrenOf parent = filter (\a -> a.parentId == Just (coerce parent.id :: UUID)) annotations
         in [hsx|
         <div class="mb-6 flex items-center gap-2 text-sm text-gray-500">
             <a href={WidgetsAction} class="hover:text-gray-700">Widgets</a>