feat: Re-add initiative branch field and add projects settings page

Allow users to specify a custom branch when creating initiatives
(auto-generated if left blank). Add updateProject tRPC procedure
and /settings/projects page with inline-editable defaultBranch.

src/trpc/routers/initiative.ts

@@ -12,6 +12,7 @@ export function initiativeProcedures(publicProcedure: ProcedureBuilder) {
     createInitiative: publicProcedure
       .input(z.object({
         name: z.string().min(1),
+        branch: z.string().nullable().optional(),
         projectIds: z.array(z.string().min(1)).min(1).optional(),
         executionMode: z.enum(['yolo', 'review_per_phase']).optional(),
       }))
@@ -35,6 +36,7 @@ export function initiativeProcedures(publicProcedure: ProcedureBuilder) {
           name: input.name,
           status: 'active',
           ...(input.executionMode && { executionMode: input.executionMode }),
+          ...(input.branch && { branch: input.branch }),
         });
 
         if (input.projectIds && input.projectIds.length > 0) {

src/trpc/routers/project.ts

@@ -90,6 +90,24 @@ export function projectProcedures(publicProcedure: ProcedureBuilder) {
         return { success: true };
       }),
 
+    updateProject: publicProcedure
+      .input(z.object({
+        id: z.string().min(1),
+        defaultBranch: z.string().min(1).optional(),
+      }))
+      .mutation(async ({ ctx, input }) => {
+        const repo = requireProjectRepository(ctx);
+        const { id, ...data } = input;
+        const existing = await repo.findById(id);
+        if (!existing) {
+          throw new TRPCError({
+            code: 'NOT_FOUND',
+            message: `Project '${id}' not found`,
+          });
+        }
+        return repo.update(id, data);
+      }),
+
     getInitiativeProjects: publicProcedure
       .input(z.object({ initiativeId: z.string().min(1) }))
       .query(async ({ ctx, input }) => {