refactor: remove non-versioned mcpb-manifest.schema.json export

Remove the generic mcpb-manifest.schema.json export from package.json
in favor of explicit versioned exports.

Changes:
- Removed ./mcpb-manifest.schema.json from package exports
- Stop generating mcpb-manifest.schema.json in dist/
- Keep mcpb-manifest.schema.json in schemas/ for backward compatibility

Consumers should now use:
- mcpb-manifest-latest.schema.json (for latest version)
- mcpb-manifest-v0.1.schema.json (for specific version)
- etc.

This makes versioning explicit and prevents ambiguity about which
schema version is being used.

package.json

@@ -27,7 +27,6 @@
       "import": "./dist/cli.js",
       "require": "./dist/cli.js"
     },
-    "./mcpb-manifest.schema.json": "./dist/mcpb-manifest.schema.json",
     "./mcpb-manifest-v0.1.schema.json": "./dist/mcpb-manifest-v0.1.schema.json",
     "./mcpb-manifest-v0.2.schema.json": "./dist/mcpb-manifest-v0.2.schema.json",
     "./mcpb-manifest-v0.3.schema.json": "./dist/mcpb-manifest-v0.3.schema.json",

scripts/build-mcpb-schema.js

@@ -12,13 +12,17 @@ import path from "node:path";
 const distDir = path.join(import.meta.dirname, "../dist");
 const schemasDir = path.join(import.meta.dirname, "../schemas");
 
-// Versioned manifest schemas
+// Versioned manifest schemas (for both dist/ and schemas/)
 const versionedManifestSchemas = {
   "mcpb-manifest-v0.1": McpbManifestSchema_v0_1,
   "mcpb-manifest-v0.2": McpbManifestSchema_v0_2,
   "mcpb-manifest-v0.3": McpbManifestSchema_v0_3,
   "mcpb-manifest-latest": McpbManifestSchemaLatest,
-  "mcpb-manifest": McpbManifestSchemaLatest, // Alias for latest
+};
+
+// Legacy alias (only for schemas/ directory, not exported from package)
+const schemasOnlyAliases = {
+  "mcpb-manifest": McpbManifestSchemaLatest,
 };
 
 // Other schemas
@@ -26,11 +30,12 @@ const otherSchemas = {
   "mcpb-signature-info": McpbSignatureInfoSchema,
 };
 
-const allSchemas = { ...versionedManifestSchemas, ...otherSchemas };
-
-// Generate all schemas to dist/
+// Generate versioned schemas and other schemas to dist/
 await fs.mkdir(distDir, { recursive: true });
-for (const [key, schema] of Object.entries(allSchemas)) {
+for (const [key, schema] of Object.entries({
+  ...versionedManifestSchemas,
+  ...otherSchemas,
+})) {
   const jsonSchema = zodToJsonSchema(schema);
   const filePath = path.join(distDir, `${key}.schema.json`);
   await fs.writeFile(filePath, JSON.stringify(jsonSchema, null, 2), {
@@ -38,9 +43,12 @@ for (const [key, schema] of Object.entries(allSchemas)) {
   });
 }
 
-// Generate all versioned manifest schemas to schemas/
+// Generate all manifest schemas to schemas/ (including legacy alias)
 await fs.mkdir(schemasDir, { recursive: true });
-for (const [key, schema] of Object.entries(versionedManifestSchemas)) {
+for (const [key, schema] of Object.entries({
+  ...versionedManifestSchemas,
+  ...schemasOnlyAliases,
+})) {
   const jsonSchema = zodToJsonSchema(schema);
   const filePath = path.join(schemasDir, `${key}.schema.json`);
   await fs.writeFile(filePath, JSON.stringify(jsonSchema, null, 2), {