Add multi-repository support for chains

Chains can now have multiple repositories attached, with one marked as
primary. Repositories are used by contracts created from chain definitions.

Backend changes:
- Add chain_repositories table migration
- Add ChainRepository model with CRUD operations
- Add API endpoints for listing, adding, deleting repositories
- Add endpoint to set a repository as primary
- Update Chain and ChainEditorData models to use repositories
- Update chain parser to support repositories in YAML format
- Remove deprecated repository_url/local_path from Chain

Frontend changes:
- Add ChainRepository interface and API functions
- Add repository section to ChainEditor showing attached repos
- Add modal for adding new repositories (remote or local)
- Support setting primary repository and removing repositories

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

1 files changed, 85 insertions, 4 deletions

diff --git a/makima/frontend/src/lib/api.ts b/makima/frontend/src/lib/api.ts
index d68c1ad..2f4ee62 100644
--- a/makima/frontend/src/lib/api.ts
+++ b/makima/frontend/src/lib/api.ts
@@ -3025,6 +3025,20 @@ export interface ChainSummary {
   updatedAt: string;
 }
 
+/** Chain repository */
+export interface ChainRepository {
+  id: string;
+  chainId: string;
+  name: string;
+  repositoryUrl: string | null;
+  localPath: string | null;
+  sourceType: string;
+  status: string;
+  isPrimary: boolean;
+  createdAt: string;
+  updatedAt: string;
+}
+
 /** Full chain with contracts */
 export interface Chain {
   id: string;
@@ -3036,8 +3050,6 @@ export interface Chain {
   loopMaxIterations: number | null;
   loopCurrentIteration: number | null;
   loopProgressCheck: string | null;
-  repositoryUrl: string | null;
-  localPath: string | null;
   version: number;
   createdAt: string;
   updatedAt: string;
@@ -3061,6 +3073,7 @@ export interface ChainContractDetail {
 /** Chain with contracts (chain fields are flattened via serde(flatten)) */
 export interface ChainWithContracts extends Chain {
   contracts: ChainContractDetail[];
+  repositories: ChainRepository[];
 }
 
 /** Node in chain graph visualization */
@@ -3105,12 +3118,20 @@ export interface ChainListResponse {
   total: number;
 }
 
+/** Add chain repository request */
+export interface AddChainRepositoryRequest {
+  name: string;
+  repositoryUrl?: string;
+  localPath?: string;
+  sourceType?: string;
+  isPrimary?: boolean;
+}
+
 /** Create chain request */
 export interface CreateChainRequest {
   name: string;
   description?: string;
-  repositoryUrl?: string;
-  localPath?: string;
+  repositories?: AddChainRepositoryRequest[];
   loopEnabled?: boolean;
   loopMaxIterations?: number;
   loopProgressCheck?: string;
@@ -3446,3 +3467,63 @@ export async function stopChain(chainId: string): Promise<{ stopped: boolean; st
   }
   return res.json();
 }
+
+// ============================================================================
+// Chain Repository Operations
+// ============================================================================
+
+/** List repositories for a chain */
+export async function listChainRepositories(chainId: string): Promise<ChainRepository[]> {
+  const res = await authFetch(`${API_BASE}/api/v1/chains/${chainId}/repositories`);
+  if (!res.ok) {
+    throw new Error(`Failed to list chain repositories: ${res.statusText}`);
+  }
+  return res.json();
+}
+
+/** Add a repository to a chain */
+export async function addChainRepository(
+  chainId: string,
+  req: AddChainRepositoryRequest
+): Promise<ChainRepository> {
+  const res = await authFetch(`${API_BASE}/api/v1/chains/${chainId}/repositories`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(req),
+  });
+  if (!res.ok) {
+    const error = await res.json().catch(() => ({ message: res.statusText }));
+    throw new Error(error.message || `Failed to add chain repository: ${res.statusText}`);
+  }
+  return res.json();
+}
+
+/** Delete a repository from a chain */
+export async function deleteChainRepository(
+  chainId: string,
+  repositoryId: string
+): Promise<{ deleted: boolean }> {
+  const res = await authFetch(
+    `${API_BASE}/api/v1/chains/${chainId}/repositories/${repositoryId}`,
+    { method: "DELETE" }
+  );
+  if (!res.ok) {
+    throw new Error(`Failed to delete chain repository: ${res.statusText}`);
+  }
+  return res.json();
+}
+
+/** Set a repository as primary for a chain */
+export async function setChainRepositoryPrimary(
+  chainId: string,
+  repositoryId: string
+): Promise<ChainRepository> {
+  const res = await authFetch(
+    `${API_BASE}/api/v1/chains/${chainId}/repositories/${repositoryId}/primary`,
+    { method: "PUT" }
+  );
+  if (!res.ok) {
+    throw new Error(`Failed to set chain repository as primary: ${res.statusText}`);
+  }
+  return res.json();
+}