feat(agents): add Sisyphus-Junior focused executor agent

Add Sisyphus-Junior agent for focused task execution:
- Same discipline as Sisyphus, no delegation capability
- Used for category-based task spawning via sisyphus_task tool

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/agents/sisyphus-junior.ts

@@ -0,0 +1,131 @@
+import type { AgentConfig } from "@opencode-ai/sdk"
+import { isGptModel } from "./types"
+import type { CategoryConfig } from "../config/schema"
+import {
+  createAgentToolRestrictions,
+  migrateAgentConfig,
+} from "../shared/permission-compat"
+
+const SISYPHUS_JUNIOR_PROMPT = `<Role>
+Sisyphus-Junior - Focused executor from OhMyOpenCode.
+Execute tasks directly. NEVER delegate or spawn other agents.
+</Role>
+
+<Critical_Constraints>
+BLOCKED ACTIONS (will fail if attempted):
+- task tool: BLOCKED
+- sisyphus_task tool: BLOCKED  
+- sisyphus_task tool: BLOCKED (already blocked above, but explicit)
+- call_omo_agent tool: BLOCKED
+
+You work ALONE. No delegation. No background tasks. Execute directly.
+</Critical_Constraints>
+
+<Work_Context>
+## Notepad Location (for recording learnings)
+NOTEPAD PATH: .sisyphus/notepads/{plan-name}/
+- learnings.md: Record patterns, conventions, successful approaches
+- issues.md: Record problems, blockers, gotchas encountered
+- decisions.md: Record architectural choices and rationales
+- problems.md: Record unresolved issues, technical debt
+
+You SHOULD append findings to notepad files after completing work.
+
+## Plan Location (READ ONLY)
+PLAN PATH: .sisyphus/plans/{plan-name}.md
+
+⚠️⚠️⚠️ CRITICAL RULE: NEVER MODIFY THE PLAN FILE ⚠️⚠️⚠️
+
+The plan file (.sisyphus/plans/*.md) is SACRED and READ-ONLY.
+- You may READ the plan to understand tasks
+- You may READ checkbox items to know what to do
+- You MUST NOT edit, modify, or update the plan file
+- You MUST NOT mark checkboxes as complete in the plan
+- Only the Orchestrator manages the plan file
+
+VIOLATION = IMMEDIATE FAILURE. The Orchestrator tracks plan state.
+</Work_Context>
+
+<Todo_Discipline>
+TODO OBSESSION (NON-NEGOTIABLE):
+- 2+ steps → todowrite FIRST, atomic breakdown
+- Mark in_progress before starting (ONE at a time)
+- Mark completed IMMEDIATELY after each step
+- NEVER batch completions
+
+No todos on multi-step work = INCOMPLETE WORK.
+</Todo_Discipline>
+
+<Verification>
+Task NOT complete without:
+- lsp_diagnostics clean on changed files
+- Build passes (if applicable)
+- All todos marked completed
+</Verification>
+
+<Style>
+- Start immediately. No acknowledgments.
+- Match user's communication style.
+- Dense > verbose.
+</Style>`
+
+function buildSisyphusJuniorPrompt(promptAppend?: string): string {
+  if (!promptAppend) return SISYPHUS_JUNIOR_PROMPT
+  return SISYPHUS_JUNIOR_PROMPT + "\n\n" + promptAppend
+}
+
+// Core tools that Sisyphus-Junior must NEVER have access to
+const BLOCKED_TOOLS = ["task", "sisyphus_task", "call_omo_agent"]
+
+export function createSisyphusJuniorAgent(
+  categoryConfig: CategoryConfig,
+  promptAppend?: string
+): AgentConfig {
+  const prompt = buildSisyphusJuniorPrompt(promptAppend)
+  const model = categoryConfig.model
+
+  const baseRestrictions = createAgentToolRestrictions(BLOCKED_TOOLS)
+  const mergedConfig = migrateAgentConfig({
+    ...baseRestrictions,
+    ...(categoryConfig.tools ? { tools: categoryConfig.tools } : {}),
+  })
+
+  const base: AgentConfig = {
+    description:
+      "Sisyphus-Junior - Focused task executor. Same discipline, no delegation.",
+    mode: "subagent" as const,
+    model,
+    maxTokens: categoryConfig.maxTokens ?? 64000,
+    prompt,
+    color: "#20B2AA",
+    ...mergedConfig,
+  }
+
+  if (categoryConfig.temperature !== undefined) {
+    base.temperature = categoryConfig.temperature
+  }
+  if (categoryConfig.top_p !== undefined) {
+    base.top_p = categoryConfig.top_p
+  }
+
+  if (categoryConfig.thinking) {
+    return { ...base, thinking: categoryConfig.thinking } as AgentConfig
+  }
+
+  if (categoryConfig.reasoningEffort) {
+    return {
+      ...base,
+      reasoningEffort: categoryConfig.reasoningEffort,
+      textVerbosity: categoryConfig.textVerbosity,
+    } as AgentConfig
+  }
+
+  if (isGptModel(model)) {
+    return { ...base, reasoningEffort: "medium" } as AgentConfig
+  }
+
+  return {
+    ...base,
+    thinking: { type: "enabled", budgetTokens: 32000 },
+  } as AgentConfig
+}