feat: add tea-milestone.ts tool for milestone management (milestoneList, milestoneCreate)

.opencode/tools/tea-milestone.ts

@@ -0,0 +1,52 @@
+import { tool } from "@opencode-ai/plugin"
+import { $ } from "bun"
+
+export const milestoneList = tool({
+  description: "List milestones with their status and progress",
+  args: {
+    state: tool.schema.enum(["open", "closed", "all"]).default("open").describe("Filter by state"),
+  },
+  async execute(args, context) {
+    try {
+      const result = await $`tea milestone list --output json --state ${args.state}`.text()
+      return JSON.parse(result)
+    } catch (error: any) {
+      return {
+        error: "Failed to list milestones",
+        message: error.message,
+        stderr: error.stderr?.toString(),
+      }
+    }
+  },
+})
+
+export const milestoneCreate = tool({
+  description: "Create a new milestone with title, description, and optional due date",
+  args: {
+    title: tool.schema.string().describe("Milestone title"),
+    description: tool.schema.string().optional().describe("Milestone description"),
+    dueDate: tool.schema.string().optional().describe("Due date (format: YYYY-MM-DD)"),
+  },
+  async execute(args, context) {
+    try {
+      let cmd = $`tea milestone create --output json --title ${args.title}`
+      
+      if (args.description) {
+        cmd = cmd`--description ${args.description}`
+      }
+      
+      if (args.dueDate) {
+        cmd = cmd`--due-date ${args.dueDate}`
+      }
+      
+      const result = await cmd.text()
+      return JSON.parse(result)
+    } catch (error: any) {
+      return {
+        error: "Failed to create milestone",
+        message: error.message,
+        stderr: error.stderr?.toString(),
+      }
+    }
+  },
+})