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>

2 files changed, 44 insertions, 9 deletions

diff --git a/makima/src/daemon/chain/parser.rs b/makima/src/daemon/chain/parser.rs
index 0f16710..3851d1f 100644
--- a/makima/src/daemon/chain/parser.rs
+++ b/makima/src/daemon/chain/parser.rs
@@ -20,6 +20,27 @@ pub enum ParseError {
     ValidationError(String),
 }
 
+/// Repository definition in a chain.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct RepositoryDefinition {
+    /// Name of the repository
+    pub name: String,
+    /// Repository URL (for remote repos)
+    pub repository_url: Option<String>,
+    /// Local path (for local repos)
+    pub local_path: Option<String>,
+    /// Source type: remote, local, or managed
+    #[serde(default = "default_source_type")]
+    pub source_type: String,
+    /// Whether this is the primary repository
+    #[serde(default)]
+    pub is_primary: bool,
+}
+
+fn default_source_type() -> String {
+    "remote".to_string()
+}
+
 /// Chain definition parsed from YAML.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ChainDefinition {
@@ -27,11 +48,9 @@ pub struct ChainDefinition {
     pub name: String,
     /// Optional description
     pub description: Option<String>,
-    /// Repository URL (optional - contracts may have their own repos)
-    #[serde(alias = "repo")]
-    pub repository_url: Option<String>,
-    /// Local path for repository
-    pub local_path: Option<String>,
+    /// Repositories for this chain
+    #[serde(default)]
+    pub repositories: Vec<RepositoryDefinition>,
     /// Contracts in this chain
     pub contracts: Vec<ContractDefinition>,
     /// Loop configuration
diff --git a/makima/src/daemon/chain/runner.rs b/makima/src/daemon/chain/runner.rs
index 9c6f6b4..dfbcfa7 100644
--- a/makima/src/daemon/chain/runner.rs
+++ b/makima/src/daemon/chain/runner.rs
@@ -14,8 +14,8 @@ use thiserror::Error;
 use super::dag::{topological_sort, validate_dag, DagError};
 use super::parser::{parse_chain_file, ChainDefinition, ParseError};
 use crate::db::models::{
-    CreateChainContractRequest, CreateChainDeliverableRequest, CreateChainRequest,
-    CreateChainTaskRequest,
+    AddChainRepositoryRequest, CreateChainContractRequest, CreateChainDeliverableRequest,
+    CreateChainRequest, CreateChainTaskRequest,
 };
 
 /// Error type for chain runner operations.
@@ -100,11 +100,27 @@ impl ChainRunner {
                 None => (None, None, None),
             };
 
+        // Convert repository definitions to API format
+        let repositories: Vec<AddChainRepositoryRequest> = chain
+            .repositories
+            .iter()
+            .map(|r| AddChainRepositoryRequest {
+                name: r.name.clone(),
+                repository_url: r.repository_url.clone(),
+                local_path: r.local_path.clone(),
+                source_type: r.source_type.clone(),
+                is_primary: r.is_primary,
+            })
+            .collect();
+
         CreateChainRequest {
             name: chain.name.clone(),
             description: chain.description.clone(),
-            repository_url: chain.repository_url.clone(),
-            local_path: chain.local_path.clone(),
+            repositories: if repositories.is_empty() {
+                None
+            } else {
+                Some(repositories)
+            },
             loop_enabled,
             loop_max_iterations,
             loop_progress_check,