Add plan format validator hook to detect malformed task labels

- Strengthen Prometheus plan template with FORMAT constraint
- Add task label format check to Oracle phase-2 (N/6 → N/7)
- Add format checks to self-review checklist
- New plan-format-validator hook: compares raw checkbox count
  against getPlanProgress() after plan writes, warns agent when
  labels are malformed (0/0 or partial skip scenarios)

src/plugin/hooks/create-tool-guard-hooks.ts

@@ -20,6 +20,7 @@ import {
   createTeamToolGating,
   createFsyncSkipWarningHook,
   createNotepadWriteGuardHook,
+  createPlanFormatValidatorHook,
 } from "../../hooks"
 import {
   getOpenCodeVersion,
@@ -47,6 +48,7 @@ export type ToolGuardHooks = {
   fsyncSkipWarning: ReturnType<typeof createFsyncSkipWarningHook> | null
   teamToolGating: ReturnType<typeof createTeamToolGating> | null
   notepadWriteGuard: ReturnType<typeof createNotepadWriteGuardHook> | null
+  planFormatValidator: ReturnType<typeof createPlanFormatValidatorHook> | null
 }
 
 export function createToolGuardHooks(args: {
@@ -147,6 +149,10 @@ export function createToolGuardHooks(args: {
     ? safeHook("fsync-skip-warning", () => createFsyncSkipWarningHook())
     : null
 
+  const planFormatValidator = isHookEnabled("plan-format-validator")
+    ? safeHook("plan-format-validator", () => createPlanFormatValidatorHook(ctx))
+    : null
+
   const notepadWriteGuard = isHookEnabled("notepad-write-guard")
     ? safeHook("notepad-write-guard", () => createNotepadWriteGuardHook())
     : null
@@ -169,5 +175,6 @@ export function createToolGuardHooks(args: {
     fsyncSkipWarning,
     teamToolGating,
     notepadWriteGuard,
+    planFormatValidator,
   }
 }

src/plugin/tool-execute-after.ts

@@ -170,6 +170,7 @@ export function createToolExecuteAfterHandler(args: {
       await hooks.webfetchRedirectGuard?.["tool.execute.after"]?.(hookInput, output)
       await hooks.fsyncSkipWarning?.["tool.execute.after"]?.(hookInput, output)
       await hooks.jsonErrorRecovery?.["tool.execute.after"]?.(hookInput, output)
+      await hooks.planFormatValidator?.["tool.execute.after"]?.(hookInput, output)
     }
 
     if (input.tool === "extract" || input.tool === "discard") {