diff --git a/specs/editor_misc.allium b/specs/editor_misc.allium
index e4c1cb3..101ab3b 100644
--- a/specs/editor_misc.allium
+++ b/specs/editor_misc.allium
@@ -10,6 +10,7 @@
 
 use "./tabs.allium" as tabs
 use "./i18n.allium" as i18n
+use "./generation.allium" as generation
 
 -- ─── Dashboard (no tab active) ───────────────────────────────
 
@@ -395,22 +396,26 @@ surface DocumentationSurface {
 -- ─── Site validation view ───────────────────────────────────
 
 value SiteValidationReport {
+    project_id: String
     expected_url_count: Integer
     existing_html_count: Integer
     missing_url_paths: List<String>     -- in sitemap, no HTML on disk
     extra_url_paths: List<String>       -- HTML on disk, not in sitemap
     updated_post_url_paths: List<String> -- source .md newer than HTML
+    affected_sections: Set<generation/GenerationSection>
 }
 
 surface SiteValidationSurface {
     context report: SiteValidationReport
 
     exposes:
+        report.project_id
         report.expected_url_count
         report.existing_html_count
         report.missing_url_paths
         report.extra_url_paths
         report.updated_post_url_paths
+        report.affected_sections
 
     provides:
         SiteValidationScanRequested()
@@ -447,7 +452,7 @@ rule SiteValidationApply {
     -- Deletes extra HTML files, removes empty directories
     -- Regenerates calendar if anything changed
     -- Rebuilds search index if anything rendered or deleted
-    ensures: GenerateSiteRequested(sections: report.affected_sections)
+    ensures: ApplyValidationRequested(report.project_id, report.affected_sections)
 }
 
 -- ─── Translation validation view ───────────────────────────
diff --git a/specs/frontmatter.allium b/specs/frontmatter.allium
index bc7544a..7afef5d 100644
--- a/specs/frontmatter.allium
+++ b/specs/frontmatter.allium
@@ -8,6 +8,15 @@
 -- file types. The Rust implementation must read and write these
 -- formats byte-for-byte compatible with the TypeScript implementation.
 
+surface FrontmatterPersistenceSurface {
+    facing _: ContentPersistenceRuntime
+
+    provides:
+        PublishPostRequested(post)
+        PublishTemplateRequested(template)
+        PublishScriptRequested(script)
+}
+
 -- ============================================================================
 -- POST FILE FORMAT
 -- ============================================================================
diff --git a/specs/generation.allium b/specs/generation.allium
index f763af6..0279977 100644
--- a/specs/generation.allium
+++ b/specs/generation.allium
@@ -10,6 +10,23 @@ use "./metadata.allium" as meta
 use "./menu.allium" as menu
 use "./translation.allium" as translation
 
+surface GenerationControlSurface {
+    facing _: GenerationOperator
+
+    provides:
+        GenerateSiteRequested(generation)
+        ValidateSiteRequested(project)
+        ApplyValidationRequested(project_id, sections)
+}
+
+surface GenerationRuntimeSurface {
+    facing _: GenerationRuntime
+
+    provides:
+        PageRenderRequested(template, context)
+        GenerateSiteCompleted(generation)
+}
+
 value GenerationSection {
     kind: core | single | category | tag | date
 }
@@ -134,10 +151,9 @@ rule ValidateSite {
 }
 
 rule ApplyValidation {
-    when: ApplyValidationRequested(project, report)
+    when: ApplyValidationRequested(project_id, sections)
     -- Targeted re-rendering for affected sections only
-    for section in report.affected_sections:
-        ensures: GenerateSiteRequested(project, sections: {section})
+    ensures: GenerateSiteRequested(plan_generation(project_id, sections))
 }
 
 -- Day-block grouping for archives
diff --git a/specs/metadata_diff.allium b/specs/metadata_diff.allium
index 333065c..0b546fb 100644
--- a/specs/metadata_diff.allium
+++ b/specs/metadata_diff.allium
@@ -8,6 +8,14 @@ use "./media.allium" as media
 use "./script.allium" as script
 use "./template.allium" as template
 
+surface MetadataMaintenanceSurface {
+    facing _: MaintenanceOperator
+
+    provides:
+        MetadataDiffRequested(project)
+        RebuildFromFilesystemRequested(project, entity_type)
+}
+
 value DiffField {
     name: String
     db_value: String
diff --git a/specs/preview.allium b/specs/preview.allium
index b3e6072..94209b1 100644
--- a/specs/preview.allium
+++ b/specs/preview.allium
@@ -17,6 +17,22 @@ config {
     preview_port: Integer = 4123
 }
 
+surface PreviewControlSurface {
+    facing _: PreviewOperator
+
+    provides:
+        StartPreviewRequested(project)
+        StopPreviewRequested(server)
+}
+
+surface PreviewHttpSurface {
+    facing _: PreviewClient
+
+    provides:
+        PreviewRequest(path)
+        PreviewDraftRequest(path, post_id)
+}
+
 rule StartPreview {
     when: StartPreviewRequested(project)
     ensures: PreviewServer.created(
diff --git a/specs/template_context.allium b/specs/template_context.allium
index 11fcbb6..c7af5f7 100644
--- a/specs/template_context.allium
+++ b/specs/template_context.allium
@@ -12,6 +12,15 @@
 -- GLOBAL TEMPLATE VARIABLES
 -- ============================================================================
 
+surface TemplateRenderingSurface {
+    facing _: RenderPipeline
+
+    provides:
+        RenderPostPageRequested(post, language)
+        RenderListPageRequested(posts, pagination, archive_context)
+        RenderNotFoundPageRequested()
+}
+
 value RenderContext {
     -- Top-level variables available in all templates
     language: String                -- Current language code