feat(coding): add bundled plugin package selection

shared/coding-skills.ts

@@ -1,12 +1,21 @@
-export const BUNDLED_CODING_SKILL_IDS = [
+/** Skills that are part of Makelore's core coding runtime. */
+export const CORE_CODING_SKILL_IDS = [
   'agent-browser',
-  'data-service',
   'frontend-slides',
   'grilling',
   'planning-with-files',
 ] as const;
 
+/**
+ * Compatibility name for callers that enumerate skills built into the app.
+ * Plugin skills intentionally do not appear here; their package definitions
+ * are the source of truth.
+ */
+export const BUNDLED_CODING_SKILL_IDS = CORE_CODING_SKILL_IDS;
+
 export type BundledCodingSkillId = (typeof BUNDLED_CODING_SKILL_IDS)[number];
+export type PluginCodingSkillId = string;
+export type CodingSkillId = BundledCodingSkillId | PluginCodingSkillId;
 
 export const DEFAULT_PROJECT_AGENT_SKILL_IDS = [
   'agent-browser',