refactor: add domain-grouped re-exports for preferences module (#996)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/resources/extensions/gsd/preferences-hooks.ts

@@ -0,0 +1,10 @@
+/**
+ * Focused re-export: hook-related preferences.
+ *
+ * Consumers that only need hook resolution can import from this module
+ * instead of the monolithic preferences.ts, reducing coupling surface.
+ */
+export {
+  resolvePostUnitHooks,
+  resolvePreDispatchHooks,
+} from "./preferences.js";

src/resources/extensions/gsd/preferences-models.ts

@@ -0,0 +1,22 @@
+/**
+ * Focused re-export: model-related preferences.
+ *
+ * Consumers that only need model resolution can import from this module
+ * instead of the monolithic preferences.ts, reducing coupling surface.
+ */
+export {
+  // Types
+  type GSDPhaseModelConfig,
+  type GSDModelConfig,
+  type GSDModelConfigV2,
+  type ResolvedModelConfig,
+
+  // Functions
+  resolveModelForUnit,
+  resolveModelWithFallbacksForUnit,
+  resolveDynamicRoutingConfig,
+  getNextFallbackModel,
+  isTransientNetworkError,
+  validateModelId,
+  updatePreferencesModels,
+} from "./preferences.js";

src/resources/extensions/gsd/preferences-skills.ts

@@ -0,0 +1,18 @@
+/**
+ * Focused re-export: skill-related preferences.
+ *
+ * Consumers that only need skill resolution can import from this module
+ * instead of the monolithic preferences.ts, reducing coupling surface.
+ */
+export {
+  // Types
+  type GSDSkillRule,
+  type SkillDiscoveryMode,
+  type SkillResolution,
+  type SkillResolutionReport,
+
+  // Functions
+  resolveAllSkillReferences,
+  resolveSkillDiscoveryMode,
+  resolveSkillStalenessDays,
+} from "./preferences.js";

src/resources/extensions/gsd/preferences.ts

@@ -261,6 +261,7 @@ export function loadEffectiveGSDPreferences(): LoadedGSDPreferences | null {
 }
 
 // ─── Skill Reference Resolution ───────────────────────────────────────────────
+// Focused re-exports available via ./preferences-skills.js
 
 export interface SkillResolution {
   /** The original reference from preferences (bare name or path). */
@@ -547,6 +548,9 @@ export function getIsolationMode(): "none" | "worktree" | "branch" {
   return "worktree"; // default
 }
 
+// ─── Model Resolution ─────────────────────────────────────────────────────────
+// Focused re-exports available via ./preferences-models.js
+
 /**
  * Resolve which model ID to use for a given auto-mode unit type.
  * Returns undefined if no model preference is set for this unit type.
@@ -1389,6 +1393,9 @@ function mergePostUnitHooks(
   return merged.length > 0 ? merged : undefined;
 }
 
+// ─── Hook Resolution ──────────────────────────────────────────────────────────
+// Focused re-exports available via ./preferences-hooks.js
+
 /**
  * Resolve enabled post-unit hooks from effective preferences.
  * Returns an empty array when no hooks are configured.