fix(hooks,tools): replace /plan example with prometheus delegation and rename code-review example to review-work (#2633, #3285, #2873)

- context-info-builder referenced a non-existent /plan command;
  now directs users to the Prometheus agent for planning
- skill tool description example referenced 'code-review' which
  does not exist; changed to 'review-work' (actual built-in skill)
- skill tool execute path now surfaces the missing host permission
  gap so callers understand OpenCode plugin context limits

🤖 Generated with OhMyOpenCode assistance
https://github.com/code-yeongyu/oh-my-opencode

src/hooks/start-work/context-info-builder.ts

@@ -6,10 +6,7 @@ import {
   findPrometheusPlans,
   getPlanName,
   getPlanProgress,
-  getTaskSessionState,
   readBoulderState,
-  readCurrentTopLevelTask,
-  upsertTaskSessionState,
   writeBoulderState,
 } from "../../features/boulder-state"
 import { log } from "../../shared/logger"
@@ -97,8 +94,8 @@ Ask the user which plan to work on.`
   return `
 ## Plan Not Found
 
-Could not find a plan matching "${explicitPlanName}".
-No incomplete plans available. Create a new plan with: /plan "your task"`
+ Could not find a plan matching "${explicitPlanName}".
+ No incomplete plans available. Create a new plan using the Prometheus agent.`
 }
 
 function buildExplicitPlanContext(params: {
@@ -125,8 +122,8 @@ function buildExplicitPlanContext(params: {
     return `
 ## Plan Already Complete
 
-The requested plan "${getPlanName(matchedPlan)}" has been completed.
-All ${progress.total} tasks are done. Create a new plan with: /plan "your task"`
+ The requested plan "${getPlanName(matchedPlan)}" has been completed.
+ All ${progress.total} tasks are done. Create a new plan using the Prometheus agent.`
   }
 
   if (existingState) {
@@ -224,8 +221,8 @@ function buildPlanDiscoveryContext(params: {
     return contextInfo + `
 ## No Plans Found
 
-No Prometheus plan files found at .sisyphus/plans/
-Use Prometheus to create a work plan first: /plan "your task"`
+ No Prometheus plan files found in the .sisyphus plans directory.
+ Use the Prometheus agent to create a work plan first.`
   }
 
   if (incompletePlans.length === 0) {
@@ -233,7 +230,7 @@ Use Prometheus to create a work plan first: /plan "your task"`
 
 ## All Plans Complete
 
-All ${plans.length} plan(s) are complete. Create a new plan with: /plan "your task"`
+ All ${plans.length} plan(s) are complete. Create a new plan using the Prometheus agent.`
   }
 
   if (incompletePlans.length === 1) {

src/hooks/start-work/index.test.ts

@@ -6,6 +6,7 @@ import { join } from "node:path"
 import { tmpdir } from "node:os"
 import { randomUUID } from "node:crypto"
 import { createStartWorkHook } from "./index"
+import { buildStartWorkContextInfo } from "./context-info-builder"
 import { createAtlasHook } from "../atlas"
 import {
   writeBoulderState,
@@ -67,6 +68,27 @@ You are starting a Sisyphus work session.
   })
 
   describe("chat.message handler", () => {
+    test("should not include /plan literal in missing-plan guidance", () => {
+      // given
+      const contextInfo = buildStartWorkContextInfo({
+        ctx: createMockPluginInput(),
+        explicitPlanName: null,
+        existingState: null,
+        sessionId: "session-123",
+        timestamp: "2026-04-12T00:00:00.000Z",
+        activeAgent: "sisyphus",
+        worktreePath: undefined,
+        worktreeBlock: "",
+      })
+
+      // when
+      const containsLegacyPlanCommand = contextInfo.includes("/plan")
+
+      // then
+      expect(containsLegacyPlanCommand).toBe(false)
+      expect(contextInfo).toContain("Prometheus")
+    })
+
     test("should ignore non-start-work commands", async () => {
       // given - hook and non-start-work message
       const hook = createStartWorkHook(createMockPluginInput())