feat(WP-0015/B1-B6): StaticPages controller and public intro/tutorial UI

B1 — Web/Controller/StaticPages.hs: LandingAction, CapabilitiesAction,
     TutorialAction, ExtensionGuideAction (no auth guard)
B2 — Web/View/StaticPages/Landing.hs: hero, traceability chain, capability
     grid, GAAF status bar, CTAs to capabilities and management UI
B3 — Web/View/StaticPages/Capabilities.hs: 12-phase capability map, GAAF
     scorecard, API v1/v2 surface table, learning loop, type registry system
B4 — Web/View/StaticPages/Tutorial.hs: 6-step developer tutorial (widgets,
     events, governance, deployment, learning, federation)
     Web/View/StaticPages/ExtensionGuide.hs: 6-step hub extension guide
     (HubCapabilityManifest, type registry, widgets, patterns, agents)
     with GAAF rules summary
B5 — Web/Routes.hs: StaticPagesController manual routes; "/" → Landing,
     "/capabilities", "/tutorial", "/extension-guide"
     Web/Types.hs: StaticPagesController data type
B6 — Web/FrontController.hs: import StaticPagesController; register route
     (last, catches root); nav adds About/Tutorial/Extend links and
     separator; logo now links to LandingAction

B7 (deployment verification) remains pending until devenv up is available.

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

Web/Controller/StaticPages.hs

@@ -0,0 +1,18 @@
+module Web.Controller.StaticPages where
+
+-- WP-0015 — Public-facing intro and tutorial pages (no auth required)
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ControllerPrelude
+import Web.View.StaticPages.Landing
+import Web.View.StaticPages.Capabilities
+import Web.View.StaticPages.Tutorial
+import Web.View.StaticPages.ExtensionGuide
+
+instance Controller StaticPagesController where
+    action LandingAction       = render LandingView
+    action CapabilitiesAction  = render CapabilitiesView
+    action TutorialAction      = render TutorialView
+    action ExtensionGuideAction = render ExtensionGuideView