Implement governed hybrid campaign delivery

src/govoplan_campaign/backend/campaign/validation.py

@@ -482,6 +482,7 @@ def _delivery_issues(
     config: CampaignConfig,
     *,
     postbox_available: bool,
+    templates_available: bool,
 ) -> list[SemanticIssue]:
     issues: list[SemanticIssue] = []
     policies = _delivery_policies(config)
@@ -533,6 +534,46 @@ def _delivery_issues(
             postbox_available=postbox_available,
         )
     )
+    if any(policy.uses_print for policy in policies):
+        if not templates_available:
+            issues.append(
+                _issue(
+                    Severity.ERROR,
+                    "templates_unavailable",
+                    "Printable Campaign delivery requires the optional Templates renderer.",
+                    "/delivery/print/template_id",
+                )
+            )
+        if not config.delivery.print.template_id:
+            issues.append(
+                _issue(
+                    Severity.ERROR,
+                    "print_template_missing",
+                    "Select a published compatible template for printable Campaign output.",
+                    "/delivery/print/template_id",
+                )
+            )
+        elif config.delivery.print.template_revision is None:
+            issues.append(
+                _issue(
+                    Severity.ERROR,
+                    "print_template_revision_missing",
+                    "Printable delivery must pin one published template revision.",
+                    "/delivery/print/template_revision",
+                )
+            )
+        for entry_index, entry in enumerate(_active_delivery_entries(config)):
+            if not effective_delivery_channel_policy(config, entry).uses_print:
+                continue
+            if entry.print_target is None:
+                issues.append(
+                    _issue(
+                        Severity.ERROR,
+                        "print_target_missing",
+                        "Printable delivery requires an explicit postal or internal-mail target.",
+                        f"/entries/inline/{entry_index}/print_target",
+                    )
+                )
     return issues
 
 
@@ -784,6 +825,7 @@ def validate_campaign_config(
     campaign_file: str | Path | None = None,
     check_files: bool = False,
     postbox_available: bool = False,
+    templates_available: bool = False,
 ) -> SemanticReport:
     campaign_path = Path(campaign_file).resolve() if campaign_file else Path.cwd() / "campaign.json"
     issues: list[SemanticIssue] = []
@@ -799,6 +841,7 @@ def validate_campaign_config(
         _delivery_issues(
             config,
             postbox_available=postbox_available,
+            templates_available=templates_available,
         )
     )
     issues.extend(_sender_issues(config))