feat: Add contract type templates API endpoint

Add a new API endpoint to provide contract type templates (workflow
definitions) separate from file templates. This enables the create
contract page to dynamically show available contract types.

Changes:
- Add ContractTypeTemplate struct in templates.rs with id, name,
  description, phases, default_phase, and is_builtin fields
- Add built-in contract types: 'simple' (plan/execute) and
  'specification' (research/specify/plan/execute/review)
- Add GET /api/v1/contract-types endpoint returning all contract types
- Add frontend ContractTypeTemplate interface and listContractTypes()
  API function

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/makima/frontend/src/lib/api.ts b/makima/frontend/src/lib/api.ts
index 76ee4d4..1ae4103 100644
--- a/makima/frontend/src/lib/api.ts
+++ b/makima/frontend/src/lib/api.ts
@@ -2008,6 +2008,42 @@ export async function getTemplate(id: string): Promise<FileTemplate> {
 }
 
 // =============================================================================
+// Contract Type Templates (Workflow Definitions)
+// =============================================================================
+
+/** A contract type template defining a workflow */
+export interface ContractTypeTemplate {
+  /** Unique identifier (e.g., 'simple', 'specification', 'feature-development') */
+  id: string;
+  /** Display name */
+  name: string;
+  /** What this contract type is for */
+  description: string;
+  /** Ordered list of phases in the workflow */
+  phases: string[];
+  /** Starting phase */
+  defaultPhase: string;
+  /** True for built-in types ('simple', 'specification') */
+  isBuiltin: boolean;
+}
+
+export interface ListContractTypesResponse {
+  contractTypes: ContractTypeTemplate[];
+}
+
+/**
+ * List all available contract type templates.
+ * Returns built-in types (simple, specification) and any custom types.
+ */
+export async function listContractTypes(): Promise<ListContractTypesResponse> {
+  const res = await authFetch(`${API_BASE}/api/v1/contract-types`);
+  if (!res.ok) {
+    throw new Error(`Failed to list contract types: ${res.statusText}`);
+  }
+  return res.json();
+}
+
+// =============================================================================
 // Supervisor Question Types and Functions
 // =============================================================================