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/hooks/sisyphus-junior-notepad/index.ts

@@ -0,0 +1,45 @@
+import type { PluginInput } from "@opencode-ai/plugin"
+import { isCallerOrchestrator } from "../../shared/session-utils"
+import { SYSTEM_DIRECTIVE_PREFIX } from "../../shared/system-directive"
+import { log } from "../../shared/logger"
+import { HOOK_NAME, NOTEPAD_DIRECTIVE } from "./constants"
+
+export * from "./constants"
+
+export function createSisyphusJuniorNotepadHook(ctx: PluginInput) {
+  return {
+    "tool.execute.before": async (
+      input: { tool: string; sessionID: string; callID: string },
+      output: { args: Record<string, unknown>; message?: string }
+    ): Promise<void> => {
+      // 1. Check if tool is delegate_task
+      if (input.tool !== "delegate_task") {
+        return
+      }
+
+      // 2. Check if caller is Atlas (orchestrator)
+      if (!isCallerOrchestrator(input.sessionID)) {
+        return
+      }
+
+      // 3. Get prompt from output.args
+      const prompt = output.args.prompt as string | undefined
+      if (!prompt) {
+        return
+      }
+
+      // 4. Check for double injection
+      if (prompt.includes(SYSTEM_DIRECTIVE_PREFIX)) {
+        return
+      }
+
+      // 5. Prepend directive
+      output.args.prompt = NOTEPAD_DIRECTIVE + prompt
+
+      // 6. Log injection
+      log(`[${HOOK_NAME}] Injected notepad directive to delegate_task`, {
+        sessionID: input.sessionID,
+      })
+    },
+  }
+}