feat(hooks): add sisyphus-junior-notepad hook for conditional notepad rules injection (#1092)

* refactor(shared): extract isCallerOrchestrator to session-utils

* refactor(atlas): use shared isCallerOrchestrator, change to prepend

* refactor(prometheus-md-only): change to prepend pattern

* refactor(sisyphus-junior): remove Work_Context (moved to hook)

* feat(hooks): add sisyphus-junior-notepad hook

* fix(shared): replace dynamic require with static import in session-utils

- Change from dynamic require to static import for better bundler compatibility
- Fix import path: ../../features -> ../features
- Add barrel export to src/shared/index.ts

* feat(hooks): register sisyphus-junior-notepad hook

- Add to HookNameSchema in schema.ts
- Export from hooks/index.ts
- Register with isHookEnabled in index.ts
- Auto-generated schema.json update

---------

Co-authored-by: justsisyphus <justsisyphus@users.noreply.github.com>

src/config/schema.ts

@@ -83,6 +83,7 @@ export const HookNameSchema = z.enum([
   "edit-error-recovery",
   "delegate-task-retry",
   "prometheus-md-only",
+  "sisyphus-junior-notepad",
   "start-work",
   "atlas",
 ])