fix: rename opencode → altimate-code across all install/upgrade paths

6 fixes in installation/index.ts:
1. method() detection: add .altimate-code path check for curl installs
2. scoop detection: opencode → altimate-code in list command
3. choco detection: opencode → altimate-code in list command
4. scoop upgrade: opencode@{version} → altimate-code@{version}
5. choco upgrade: opencode → altimate-code package name
6. choco error: remove hardcoded error message, use actual stderr
7. scoop latest: opencode.json → altimate-code.json URL
8. choco latest: opencode → altimate-code in API query
9. installedName: scoop/choco detect altimate-code not opencode

Found by install matrix CI — 55 combinations across npm, npx, pnpm,
bun, brew, curl, scoop, choco on Ubuntu, macOS, Windows.

Author: dev-punia-altimate

packages/opencode/src/installation/index.ts

@@ -101,6 +101,7 @@ export namespace Installation {
 
   export async function method() {
     if (process.execPath.includes(path.join(".opencode", "bin"))) return "curl"
+    if (process.execPath.includes(path.join(".altimate-code", "bin"))) return "curl"
     if (process.execPath.includes(path.join(".local", "bin"))) return "curl"
     const exec = process.execPath.toLowerCase()
 
@@ -129,11 +130,11 @@ export namespace Installation {
       // altimate_change end
       {
         name: "scoop" as const,
-        command: () => text(["scoop", "list", "opencode"]),
+        command: () => text(["scoop", "list", "altimate-code"]),
       },
       {
         name: "choco" as const,
-        command: () => text(["choco", "list", "--limit-output", "opencode"]),
+        command: () => text(["choco", "list", "--limit-output", "altimate-code"]),
       },
     ]
 
@@ -149,7 +150,7 @@ export namespace Installation {
       const output = await check.command()
       // altimate_change start — package names for detection
       const installedName =
-        check.name === "brew" ? "altimate-code" : check.name === "choco" || check.name === "scoop" ? "opencode" : "@altimateai/altimate-code"
+        check.name === "brew" ? "altimate-code" : check.name === "choco" || check.name === "scoop" ? "altimate-code" : "@altimateai/altimate-code"
       // altimate_change end
       if (output.includes(installedName)) {
         return check.name
@@ -222,19 +223,18 @@ export namespace Installation {
       }
 
       case "choco":
-        result = await Process.run(["choco", "upgrade", "opencode", `--version=${target}`, "-y"], { nothrow: true })
+        result = await Process.run(["choco", "upgrade", "altimate-code", `--version=${target}`, "-y"], { nothrow: true })
         break
       case "scoop":
-        result = await Process.run(["scoop", "install", `opencode@${target}`], { nothrow: true })
+        result = await Process.run(["scoop", "install", `altimate-code@${target}`], { nothrow: true })
         break
       default:
         throw new Error(`Unknown method: ${method}`)
     }
     // altimate_change start — telemetry for upgrade result
     const telemetryMethod = (["npm", "bun", "brew"].includes(method) ? method : "other") as "npm" | "bun" | "brew" | "other"
     if (!result || result.code !== 0) {
-      const stderr =
-        method === "choco" ? "not running from an elevated command shell" : result?.stderr.toString("utf8") || ""
+      const stderr = result?.stderr.toString("utf8") || "upgrade failed (unknown error)"
       const T = await getTelemetry()
       T.track({
         type: "upgrade_attempted",
@@ -317,7 +317,7 @@ export namespace Installation {
 
     if (detectedMethod === "choco") {
       return fetch(
-        "https://community.chocolatey.org/api/v2/Packages?$filter=Id%20eq%20%27opencode%27%20and%20IsLatestVersion&$select=Version",
+        "https://community.chocolatey.org/api/v2/Packages?$filter=Id%20eq%20%27altimate-code%27%20and%20IsLatestVersion&$select=Version",
         { headers: { Accept: "application/json;odata=verbose" } },
       )
         .then((res) => {
@@ -328,7 +328,7 @@ export namespace Installation {
     }
 
     if (detectedMethod === "scoop") {
-      return fetch("https://raw.githubusercontent.com/ScoopInstaller/Main/master/bucket/opencode.json", {
+      return fetch("https://raw.githubusercontent.com/ScoopInstaller/Main/master/bucket/altimate-code.json", {
         headers: { Accept: "application/json" },
       })
         .then((res) => {