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/FederatedGovernance/Dashboard.hs

@@ -184,7 +184,7 @@ instance View FederatedGovernanceDashboardView where
 
         -- ── Panel 5: Archive activity ─────────────────────────────────────
         archiveByType = List.sortBy (\a b -> compare (fst a) (fst b))
-                      $ map (\grp -> ((head grp).subjectType, length grp))
+                      $ map (\grp -> (maybe "" (.subjectType) (head grp), length grp))
                       $ List.groupBy (\a b -> a.subjectType == b.subjectType)
                       $ List.sortBy (\a b -> compare a.subjectType b.subjectType) recentArchives